"So you and I are going to give both of them 'The Talk', together?" Night Light asked. Twilight Velvet nodded.

"Twilight is old enough to know and understand," Velvet said "Shining is home for the summer, and they're both getting curious about each other. We should at least educate them about what they're feeling and doing before they... have to learn a hard lesson from a mistake," she said, putting emphasis into the word. Night Light gulped. "I'm not ready to be a grandmare yet."

"Yeah. I hear that," Night agreed. "So when do you want to do this?"

"Hey Dad," Shining said, walking into the kitchen. Twilight was close behind him. "We have a question for you!"

"Right now, apparently," Velvet muttered.

"Why does Shining's 'thing' get hard?" Twilight asked. Night Light looked at his son.

"Do... you... not know?" he asked. Shining shook his head. A late bloomer, indeed, Night thought. He had never made a point to consider the nature of his son's 'personal time' before. By the time Night was Shining's age, he had already 'discovered' himself. But then again, Night hadn't gone to the Royal Guard Junior Academy as early as Shining had. So he had more time to spend on 'research' before he was given libido-suppression medicine in the Guard training. Even so, it was staggering for Night to think that Shining was as old as he was without ever having learned to masturbate.

"It just gets like that when I first wake up, and when I take a bath," Shining said.

"I'm curious too, even though I don't have one," Twilight said. Night Light looked at his daughter. He'd always said that she was too smart for her own good.

"And you've never read anything about it?" Night asked. Twilight shook her head.

"We aren't going to be studying anatomy at school for a few years, and I haven't studied that far ahead on my own yet," Twilight said. Night rubbed his forehead.

"Okay. Wow. I guess we need to just start completely from scratch," he said. "So, starting with some basic terminology. Your brother's 'thing' is actually called a-"

"Um, why don't we head upstairs to the classroom to learn about this?" Velvet suggested.

"Okay!" Shining and Twilight both said, running upstairs. As a home-school teacher, the 'classroom' was the master bedroom. The kitchen ceiling shook as they both jumped on their parents' bed.

"What are you doing?" Night asked Velvet.

"It just seems like that's the place for this sort of discussion, rather than the kitchen," Velvet said. "You know, in case they're visual learners."

"What exactly are you planning?" Night asked nervously. "Do you really expect us to... do that in front of them?" Velvet shrugged.

"Night, honestly, what other lines are there left to cross!?" she asked. "You've already done it with Cadance..." His face turned red as he rubbed his forehead and sighed in defeat.

"Fuck it! Two tickets to Tartarus, please." He got up from the table and they walked to the stairs. Velvet held his hoof.

"We're just going to be direct, and honest. We're a no-Santa-Paws family, right?" she asked.

"No Santa Paws," he agreed. They walked up to their bedroom. Shining and Twilight were waiting patiently on their bed. "Alright you two, move down to the end of the bed," Night said. Shining and Twilight did as they were told. Night and Velvet moved their pillows aside and sat opposite them, at the head of the bed.

"Class time," Velvet said, as she did while she was home-schooling them.

"Yay!" Twilight cheered. Normally, Shining would melodramatically groan about home-school class time. But today, while not as vocally enthusiastic as his sister, he was genuinely interested about the subject they would be learning.

"So you're going to teach us why his thing gets hard?" Twilight asked.

"Yes," Velvet said. "But it's part of a much bigger question: 'Where do foals come from'?" Shining had seen a few pregnant mares in his time. He understood the vague connection that it meant that they were going to have a foal.

"From moms," Shining said. "Pregnant moms."

"That's correct," Velvet said. "But there is a lot more to it than that. You see, when a mare and a stallion love each other, and the mare decides that she wants a foal, she and a stallion... have sex."

"Sex?" Shining asked.

"Is that a food? Is it like cake?" Twilight asked.

"No. It's something that ponies do, like 'have a party'," Velvet explained.

"Oh," Twilight said.

"How do you have sex?" Shining asked. As much as she had expected it, nothing could really have prepared Velvet for the directness of the question.

"Well... uh," Velvet tried to think. "Sex is... a lot like dancing. There are are a lot of ways to do it, and there are different kinds of sex. But most of them have the same basic parts. And speaking of parts, let's get back to that terminology." Velvet looked at Night Light, encouraging him to participate in the discussion.

"Uh, okay, right." He cleared his throat. "As I was saying downstairs, your brother's 'thing' is called a penis."

"A penis," Twilight repeated, looking over at her brother's crotch. His penis was still hidden away inside his sheath.

"What about Twilight?" Shining asked.

"Your sister has a vagina," Velvet explained. Shining looked over at Twilight's crotch. But the way she was sitting hid it from his view. Likewise, Twilight was still looking at his. Specifically at his balls.

"What about the other things?" she asked.

"Those are called testicles," Night said.

"Why don't fillies have them?" Twilight asked.

"Well fillies do have something like testicles," Velvet said. "They're called ovaries. And they're inside you." Velvet placed her hooves on her own abdomen to show approximately where they would be inside her. "When a mare is ready to have a foal, she goes into heat. And then-"

"Ooh! They get the itchies!" Twilight said. "That's why we take the medicine."

"That's right," Velvet said. As a mare now, Twilight was in the midst of her first heat that summer. Velvet made sure to give her her own supply of Beat the Heat potion for her season. She explained that it helped to get rid of the 'itchies' she was feeling 'down there'.

"When a mare is ready to have a foal, she goes into heat," Velvet continued. "Her vagina will feel hot, and itchy sometimes. It can be very uncomfortable for a mare. It can cloud her judgement, and make her act without thinking. The medicine helps with that."

"A mare in heat also makes pheromones," Night Light said.

"Farra-whats?" Shining asked.

"Pheromones. They're like a perfume that a mare makes." Night said. "It smells really nice to a stallion, and helps a mare to attract a mate."

"Like incest!" Twilight said.

"W-what!?" Night Light blanched.

"Ants use faro-moans to make paths and communicate with the colony," she said.

"Oh, insects! Yes, that's correct," Night said. "A mare makes pheromones in her skin, fur, and mane. But mostly, stallions are attracted to the pheromones from her vagina."

"Colts want to smell my butt?" Twilight asked. Velvet laughed out loud at how silly, yet accurate the statement was.

"Yeah, pretty much," she chuckled. "But that is how a stallion will know that a mare is ready to have a foal. And the stallion will get an erection, which is what it's called when his penis gets hard like that."

"Why?" Twilight asked.

"Because that is how a stallion has sex," Velvet said. She rubbed her hoof into her pussy. She found that she was more turned on from the talk than she would have cared to admit. She took her wet hoof and rubbed Night's nose with it.

"Hey!" Night said in surprise. Velvet just put her wet hoof in his open mouth, flooding both of his senses. Shining and Twilight both laughed. But the effect was practically immediate. Night Light's penis began to emerge from his sheath. He tried to instinctively cover himself, but Velvet kept him still.

"Oh, wow." Twilight said, watching in awe as it grew before her very eyes.

"As you can see, your father smelled my pheromones, and now he has an erection," Velvet explained. It was an understatement. He was rock hard and beet red with embarrassment being put on display before them like that. "Once a stallion has an erection, he places his penis inside the mare's vagina-"

"But I poop from there!" Twilight said. Velvet couldn't help but laugh again.

"No, Twilight, you don't poop from your vagina. It's a different thing. You, uh, it's uh-" Velvet tried to shift in her seat. "Sweetie, can you help? Turn around."

"Uh, okay..." He stood on the bed and faced away from them. His erection bobbed beneath him as he did. Velvet stood to join him and also turned around. Her magic pulled both of their tails aside.

"You see, you're father and I both have a poop hole. It's called an anus, and everypony has one. Everypony poops."

"Even Princess Celestia?" Twilight asked.

"Oh, yes. She poops from her butt," Night said.

"So a stallion puts his penis in a mare's anus?" Shining asked.

"Well... you can..." Night said with a grin. Velvet gave him an admonishing slap.

"Can we just stick to the basics!?" Velvet said.

"Okay. Fine," he said.

"Aaanyways!" Velvet tried to get the discussion back on track. "Below a mare's anus is her vagina," Velvet said as she looked back at the two students. Night Light moved back and pointed at Velvet's vagina with his hoof.

"But I pee from there!" Twilight said. Velvet stifled her giggle.

"Sort of," Velvet said, looking at Night. "Dear?" Night Light placed a hoof on the side of her marehood and pulled it open a bit. "There are actually two holes. The small one, below, is called the urethra. That's where pee comes from. But next to that is the other hole. That's the vagina. During sexual intercourse, the stallion puts his penis into the vagina," Velvet explained. At the other end of the bed, Twilight leaned closer and squinted at her mother's vagina. Then she looked at her father's penis.

"But something so big can't fit in there," Twilight said in doubt. Night Light blushed with pride.

"It can fit," Velvet assured her. "The vagina is a flexible muscle that can stretch open for a penis to enter. But it helps if both parts are lubricated. Which leads us to foreplay."

"Because there's four of us?" Shining asked. Velvet rolled her eyes.

"No. Foreplay is a type of sex that happens before intercourse," Velvet said, putting emphasis into the word. She and Night Light both turned around to face their kids and sat down. Night's erection was hard as ever with Velvet's scent still smeared on his nose and her ongoing demonstration of her anatomy. "As I said, the main purpose is to help each of the parts get wet so that they can be put together more easily."

"Like grease on a carriage wheel," Night said.

"But you wouldn't use grease for this," Velvet said.

"You use water, duh!" Twilight said.

"Actually, water would be a poor choice too," Velvet said. "Most ponies use saliva, which is spit."

"You spit on it?" Shining asked.

"You can," Night said. "If you're using your hoof, by yourself." He looked at Velvet. "But that's not as much fun."

"A mare can do it for the stallion like this," Velvet said as she leaned over and began to lick Night's penis.

"Eww!" Twilight recoiled. "You're licking his peepee!" Velvet laughed a little at her innocent term for it.

"Well yes, some parts of sex seem gross at first. But it really is okay to lick a stallion's penis," Velvet said. "Your father is a clean pony, and this is perfectly fine when a stallion has good hygiene." She resumed licking and moved her head up to the tip and began sucking his dick.

"This type of sex is called oral sex," Night Light said as Velvet sucked him off. "Because she's using her mouth. Sometimes you can have just oral sex, without going any furtherhuhuuh!" Night gasped as Velvet began to swallow his penis. Twilight watched in awe at the bulge moving down her throat until her nose bumped into his belly.

Shining was barely paying attention. He was too preoccupied with looking under Velvet's tail. Her rump pointed at him while she was sucking on Night Light. He leaned closer to get a better look. He recognized the smell of his mother's shampoo in her tail but there was something else. He hadn't the vocabulary to describe it, besides 'pheromones'. That was even if his conscious mind recognized it. To him, it just smelled really good, even if he didn't fully understand why. But the effect was obvious as he quickly sprouted to a full erection.

"Sweetie, there's no need to show off," Night Light breathed. Velvet held herself there with his cock in her throat for just a moment before pulling off of him completely to catch her breath. She sat back down beside him to face the students. "The important part to remember is to keep your teeth off of it," Night said to Twilight.

"What does it feel like?" Shining asked.

"Really good!" Night said without hesitation.

"Can you do it to me?" Shining asked, pointing at his own rigid penis. Night Light and Velvet were both equally unprepared for the request, each deferring to the other.

"Well, uh, I don't think..."

"Uh, well, we really shouldn't..."

"Please?" Shining begged. Night Light winced. He remembered what it felt like to be his age. Shining was painfully erect. Both parents looked at each other with the same unsure hesitation, but they both shrugged with the same neutral absence of objection.

"I mean, I guess..."

"If it's alright with you..."

After years of marriage, each had the ability to read the thoughts behind the other's expression. After all, it had been Velvet that convinced Night to do anything for their daughter, Cadance. And Night that had actually done it. But while Cadance was none the wiser to the true nature of the interaction, Shining and Twilight were perfectly aware that these were their parents. It was a situation that needed to be handled very carefully. It was only weird if they make it.

"Um, okay..." Velvet said at last as she moved over towards Shining. He sat there, eagerly pointing his penis at her. He was still a growing colt, but it was already nearly as big as Night's. Night did not fail to notice this fact as well, feeling a mixture of both pride and shame. "But before we go any further, I need to explain something very important to both of you," she said. They both gave her their undivided attention. "Ponies that go to public school don't learn about this stuff in this way. Just books and pictures."

"This is better!" Shining assured her.

"Thank you, dear," Velvet replied. "But it is also very unusual. You need to understand that normal ponies do not do this sort of thing with their family members."

"Why?" Twilight asked.

"That's just the rule," Velvet said. "We're only showing you this now because you're home-schooled, and we want to teach you about it. But ponies would think that this sort of thing would be wrong for us to do together like this."

"But why? It doesn't seem wrong to me," Twilight said.

"Yeah, me either," Shining agreed. Velvet struggled to grapple with her own internal conflicts regarding her own morality on the matter and that of popular opinion at large. Her own inherent rationalist personality weighed against her desire for objectivity.

"Okay, but, this sort of thing is like pineapple on pizza," Velvet said. "You might not think that there is anything wrong with it, but some ponies might. So you mustn't tell anypony about this okay? What happens secretly in our family stays in our family. Okay?"

"Okay," Twilight and Shining both responded.

"Promise?" Velvet asked.

"We promise."

"Okay then," Velvet said. She took a deep breath to steel her nerves as she knelt in front of Shining. She reached out with her hoof and touched his penis. It jerked in reaction to the contact.

"Ooh," he said, feeling the alien sensation on him.

"Well, if you haven't done it before, it is a little sensitive," Night said to him. Velvet touched Shining's penis again, letting him get used to the contact before she wrapped her hoof around it and held it a bit more firmly. She moved her hoof lightly along its surface, sliding over his skin. Shining panted, his heart raced, and his legs trembled.

"Are you ready for a little more?" Velvet asked. Shining nodded. Velvet leaned down and stuck out her tongue, licking up along the underside of his shaft.

"Oohh," Shining whimpered. She licked him again, and ran her tongue across his sensitive tip. Shining chewed his lip to keep from crying out. Velvet opened her mouth and slowly moved it over his tip, gently taking it inside. Shining felt the air rush out of his lungs. It felt so good to have his penis in his mom's mouth. It felt too good. It was so much for him to process. She waited for him, just keeping his penis head inside her mouth, trying not to move too much. At last, Shining sucked in a lungful of air.

Once she had made sure that he wasn't about to pass out, she continued. She moved her tongue inside her mouth along the ridge of his tip, causing his entire body to quiver. Once he settled down, she slowly began to bob her head a little. He began to get used to the sensation. She moved a little deeper. His hips rocked back and forth under her. She felt his hooves grab her mane and pull her deeper, causing her to gag. She slapped his hooves away and sat up.

"No!" she scolded with another cough. "Bad!" Shining recoiled immediately.

"I'm sorry, Mom! I don't know why I did that!" he said, looking genuinely confused himself. "I- I just wanted more, like you did for Dad."

"Okay. It's okay," Velvet assured him. "You just scared me. But you mustn't ever do that. You could hurt somepony like that. Do you understand?"

"Yes, Mom."

"Most mares can't go as deep as your mother, anyway," Night Light said. "So you should never expect it. It takes a lot of talent."

"This is a good time to mention the importance of consent," Velvet said. "You mustn't do anything with, or to, a pony that hasn't given you permission to do so. Always ask first. Especially when it comes to sex!"

"Can you do it some more for me? Please?" Shining begged. "I'll be good, I promise." Velvet sighed.

"Okay. But only because you said 'please'." She knelt in front of him and started sucking his dick again. She angled it toward her a little and lined herself up. She lowered herself down and felt him at the back of her mouth. She relaxed her throat and began to swallow him. Night Light watched his wife swallow Shining's penis in a fairly smooth motion until her nose bumped into his belly. Shining panted like a mare in labor, feeling his penis enveloped in her warm confines. Night's attention was pulled away as he felt his own penis being touched. He looked over at Twilight, sitting beside him, rubbing his penis with her hoof.

"Whoa, sweetie, what are you-"

"I wanna try!" Twilight said. She stuck out her tongue and started to lick his penis.

"Y- you don't have to do that!" he said.

"But I want to!" she said, giving him a pouting face. "Can I have your cunt-scent?"

"Uh... okay," Night said, "You have my consent." She grinned and kept licking him. The entire situation was far from comfortable. But in that moment, he was struggling to find a reason to stop her. Twilight opened her mouth wide and tried to suck on his tip. Night winced as he felt her inexperienced teeth graze against him. "That's... great sweetie," he said, trying to be encouraging. She tried to take a little more, but gagged a bit in the attempt.

Velvet waited as long as she could, deepthroating Shining until she felt the need for oxygen draw her away. She lifted herself back up. Shining grit his teeth and fought the urge to hold her back down, nearly sitting on his hooves. At last, Velvet let his penis flop free from her mouth. She moved back over to Night Light, tapping Twilight on the shoulder to shoo her away. Velvet looked at Night's glistening penis.

"There, nice and wet," Velvet said. "Now it's my turn." She laid down and spread her legs. "The other kind of oral sex is the kind that a mare receives," she explained. Night Light obediently laid down on his belly between her legs and spread her pussy with his hooves. She was already dripping wet. "Most mares are usually wet enough without this part. But if somepony is nice enough to give you oral sex, it's just common courtesy to reciprocate it." Night Light leaned down and began to lick Velvet's pussy. Twilight didn't have the same disgusted reaction this time. She and Shining both looked on closely with equally intense interest.

"But in addition to being courteous, oral sex for a mare is still very important," Velvet explained while Night Light continued to eat her out. "Even if a mare is already wet enough for intercourse, oral sex is often the only way some mares can achieve an orgasm."

"What's an orgasm?" Twilight asked.

"It's like a little bacteria," Shining said. Velvet grinned.

"No, Shining dear, that's an organism," Velvet corrected. "An orgasm is... it's the best part of sex," Velvet said, feeling one of her own beginning to build up. "Sex feels really good. And it keeps feeling better and better until..." Velvet shut her eyes and trembled as Night Light gave her clitoris a little lick and then a suck. She tried to keep her composure and she came against Night's tongue. He backed off for air, but Velvet grinned and ran her hoof through his mane, pulling his face back into her pussy. "...Until it feels like the best thing ever! That's an orgasm," she breathed.

"You said not to do that," Shining said as Velvet pulled on Night's head. Velvet blushed a bit in embarrassment.

"Yes, you're right. I did say that," Velvet admitted. "And normally that's true. But your father and I have been together for a long time. We trust each other and we know what out limits are. Once you are more comfortable with a pony, you can be a little rougher. But only if they like it. Isn't that right, Dear?" she asked, wiggling her hips into his face.

"Mmhmmf" Night mumbled into Velvet's dripping pussy as he nodded to the affirmative. Shining had never seen his father like this before. Even when his father was having his favorite flavor of ice cream, Shining had never seen him licking something with such tenacity.

"What does it taste like?" Shining asked.

"Good!" Night answered quickly, but rather vaguely. Velvet smiled and rolled her eyes.

"To answer your question a bit more thoroughly, the way that a mare's vagina tastes depends on a number of factors," she said. "Such as what they eat in their diet, if they're in heat, and where they are along their cycle if they are in season."

"So what does yours taste like?" Shining asked. Night Light stopped licking and looked up at Velvet from her crotch.

"Uh..." Night Light looked over at Shining. He was leaning much closer, practically over Night's shoulder. His nostrils were reflexively flaring. He looked back at Velvet. She had the same neutral expression as before. "Uh... I guess, if you're curious," Night said, "you can... try it." Shining practically shoved his dad out of the way and took his place laying down in front of Velvet's pussy. He reached out with his hoof to touch it. Velvet's magic grabbed it.

"Now do you remember how you felt when I touched you? How sensitive it was?" she asked. He looked up at her and nodded. "A mare's parts are the same way. So you need to be gentle, okay?" He nodded again and she let go of his hoof.

He moved it to touch her pussy. He could feel how warm it was against his hoof. He just ran his hoof along the edge of it, feeling its soft texture. He reached out with his other hoof and gently moved her lips apart, enraptured with the sight alone. He committed every line, every curve to memory. He mentally went over the list in his mind, identifying each of the parts. He leaned closer until Velvet could feel his breath on her marehood. Shining was confident that he could have spent the rest of his life right there, between her legs, looking at this, and smelling its wonderful aroma. But he wanted more. Velvet felt a rush of hot air as he opened his mouth.

It was Velvet's turn to gasp as she felt her son's wet tongue on her hot pussy. She trembled as he gave her a few cautious licks. He stopped for a moment and focused on her flavor in his mouth. It was hard to describe. It wasn't bad. That much he was sure about. But it wasn't like any food he knew. Sweet, savory, bitter, tart? The usual descriptors for food flavors failed him. It was simply without compare. All he knew was that he wanted to taste more of it. He leaned back down and continued licking her.

"Hey Velvet, I think he likes it," Night said, stating the obvious. Velvet wasn't listening. She was miles away. All she could think about was the feeling her son was giving her. Night Light's experience let him give her orgasms with reliable efficiency. He was good at it. Truth be told, he was great at it. But Velvet had grown used to his routine.

Shining, on the other hoof, was somepony new. He was different. Sure, he was clumsy, inexperienced and sloppy. But he was also unpredictable. Velvet had no way of telling what he was going to kiss, lick, or suck next. He was just randomly trying everything and seeing what worked. It was making her arousal curve climb and fall in erratic spikes and valleys, and it was driving her wild. Night Light moved to stop Shining,

"Alright now, why don't we-" Velvet cut off Night Light by gently, but firmly pushing him away with her magic to let Shining continue. Night Light chewed his lip uncomfortably. He was all for transparency when it came to academic curiosity. Shining wanted to know what she tasted like. Now he did. But Shining didn't want to stop tasting her, and Velvet didn't want him to stop either. Movement caught Shining's attention. Velvet's clit winked out from under it's hood.

"What's that?" he asked. Without waiting for an answer, he moved up to the top of her pussy and sucked on it.

"Shining!" Velvet moaned as she went tumbling over the edge of her climax and came into his mouth. Shining was surprised by the sudden rush of her wetness but not deterred, happily lapping it up. Velvet winced as he licked her clit again. It was too soon after she just came. She pushed him away with her hoof at last.

"Are you okay? What happened?" Shining asked. Velvety panted for a moment and tried to compose herself.

"It's okay dear," She said. "You just gave Mommy an orgasm."

"Really? So I did good?" he asked. She smiled and nodded.

"So, what does she taste like?" Twilight asked.

"Good!" Shining answered vaguely with a dumb grin and Velvet's marecum plastered on his face. "Really good!" Twilight raised an eyebrow at him and pushed him aside. She leaned down and gave Velvet's pussy an experimental sniff, followed by a couple brief licks. She sat up and rubbed her own pussy, comparing her mother's scent to her own on her hoof.

"It's good," Twilight said to Velvet. "Mine is a little more..." Twilight trailed off, struggling to find the words. "Well, yours is more... I don't know. It's hard to describe. They're similar. But I like the way yours tastes a little better." Twilight looked at the older pony's vagina again, opening it a bit with her hoof, looking at the rather small opening. "A penis is supposed to fit in there?" she asked. Velvet nodded.

"Like I said, it stretches open," Velvet said. Twilight put the tip of her hoof at Velvet's entrance, getting it wet with her juices. She pushed into it a bit and felt it give way a little. Twilight looked at her hoof. It wasn't as thick as her father's penis. So if his penis was supposed to be able to fit... Twilight pushed her hoof a little more. Velvet felt her hoof stretching her open. "Twilight...?" Twilight kept a steady pressure and moved slowly as more of her hoof went inside. "Twilight, what are you aaaah-" Velvet moaned as the widest part of Twilight's hoof slipped inside of her vagina.

"Oh... wow," Twilight breathed, feeling her mother's hot wetness around her hoof. "Doesn't it hurt?" she asked. Velvet shook her head.

"No. It feels wonderful to have a penis... or something like that in there," Velvet said. She panted as her daughter pushed her hoof deeper inside. Shining and Night Light both watched in awe as more of Twilight's arm vanished inside of Velvet.

"How deep does this go?" Twilight asked, looking at the bulge her hoof was making in her mother's abdomen. The young mare's hoof wasn't as thick as a stallion's penis yet, but her arm was certainly longer. She laid down and straightened her arm as she pushed her elbow inside.

"Ooh!" Velvet lurched as she felt Twilight's hoof reach her innermost barrier. Twilight stopped and looked at where the bulge of her hoof was in her belly. Shining leaned over and put his hoof on the bulge, feeling his sister's hoof moving around inside. "That's-" Velvet struggled to breathe with the strange sensation she was feeling inside her. "That's the end of the vagina. At the back is the cervix. Thaaaaah!" Velvet moaned out as Twilight rubbed her hoof against Velvet's cervix. "That's the entrance to the uterus, where the foal grows."

"Huh." Twilight slowly pulled her hoof out of Velvet's vagina. She, and the other two looked at how much of her arm was wet. Velvet recovered from Twilight's impromptu hoofing and sat upright. "So how does the foal get in there?" Twilight asked.

"Well, when a mare goes into heat, she releases a tiny egg that is stored in her ovaries. It goes into her uterus. Then a stallion puts his penis into the mare's vagina, and a fluid comes out that goes through the cervix and fertilizes the egg, which grows into a foal."

"A stallion pees inside the mare's vagina?" Shining asked.

"Well... you can," Night said with a wry grin.

"Night! Can we please not get into the advanced stuff!?" Velvet said.

"Hey, you like it!" he said. She blushed.

"That's- That is entirely not the point!" she stammered. "No Shining. Normally, the stallion would make a different kind of fluid, called semen. In the semen is sperm, which fertilize the egg inside the mare's uterus and make a foal." Shining looked down at his own penis. He had only ever known urine to come from it, not this 'semen' they were speaking of.

"How?" he asked.

"Wha- well, um, when the stallion's penis is stimulated, semen comes out when he has an orgasm," Velvet explained. "Either from a mare's hoof, or when you use your own hoof, while masturbating, or during oral sex. But usually during intercourse." Velvet turned sideways to them and flagged her tail at Night Light, encouraging him to demonstrate. Night Light followed her lead and stood up behind her on the bed. He reared up and mounted her. His cock bobbed and twitched under her. Velvet's magic glowed and helped to guide him to her vagina as Shining and Twilight watched. Even after she'd had her hoof in there, Twilight was still in awe seeing her father's penis start to enter.

"Once both the penis and vagina are well lubricated from the oral sex, it makes intercourse go much more smoothly, and is more pleasant," Velvet said as Night Light pushed more of his length into her. "It also helps the mare to be more likely to have an orgasm during intercourse if she has one during foreplay first." Once Night Light was completely inside her, he pulled back a bit and pushed it back in again. He repeated the motions.

"Are you trying to get it deeper?" Shining asked.

"His motion is what stimulates the penis to orgasm," Velvet explained. "Like when I was stroking yours with my hooves, and using my mouth." Shining nodded in understanding, subconsciously touching his own erection with his hoof.

"So he just keeps doing that?" Twilight asked.

"Well, a stallion can vary his depth and speed for variety," Velvet said. "You just try to find what works for you and feels nice."

"For how long?" Twilight asked.

"It depends on a lot of things," Velvet said. "Sometimes it's not long at all if you do a lot of foreplay first. Sometimes a stallion can just be really excited. And some stallions just last longer than others."

"Isn't he heavy like that?" Twilight asked.

"After a while it can be a little tiring," Velvet said, feeling the weight of her husband on her back. "But this is just one of many positions." Velvet gave Night a soft elbow to his ribs. He backed off and dismounted her. Velvet laid down and rolled over onto her back. "A mare can lay on her back like this and she and the stallion can face each other during intercourse." On cue, Night Light moved between her legs and reentered her, resuming their rutting.

"One of the positions I like is being on top." Night Light stopped again and took his turn to lay on his back. Velvet stood up and squatted over him, using her magic to align his penis again with her vagina as she lowered herself down onto it. "In this position, the mare has more control over the speed and depth of the penetration," Velvet explained, huffing as she bounced her hips up and down on her husband. "But it is a bit more work."

"Hng, Honey!" Night Light grunted. Velvet stopped moving.

"Your father is close to orgasm. So I want to demonstrate what ejaculation looks like." Velvet bounced a few more times. Night gave her a panicked tap on her thigh, signalling his climax. Velvet quickly dismounted and Night Light's penis pulled out of her. Velvet held it in her hooves and stroked as the tip began to swell and flare wide. His shaft throbbed and twitched and the first spurt of cum shot straight up and arced through the air before making a sticky white splat on Night's blue fur. Velvet quickly put her mouth over his tip and sucked as he continued to cum. Velvet swallowed his load with practiced timing of her breathing, leaving one last bit in her mouth. She showed it to everypony before she closed her mouth and swallowed that as well.

"Eww!" Twilight whined, witnessing her mother's lewd act. "Why would you do that!?" Velvet wiped her mouth and gently let her husbands penis rest on his belly until it retreated back into its sheath.

"Well, for one, semen can be quite messy," Velvet said. "It can stain fabric, and it is a nightmare to try to scrub out of your mane. So you should never ejaculate in a mare's mane."

"Unless she asks for it," Night said with a goofy grin.

"But normally, I would let your father ejaculate inside my vagina, and then go clean up in the bathroom afterwards," Velvet said. "But the important part I want to teach you is that you need to use contraceptives."

"Ketchup, or mustard?" Shining asked.

"No, those are condiments," Velvet said. "Contraceptives are things that prevent a mare from becoming pregnant. As unicorns, we can use a spell that prevents the mare from ovulating, or releasing an egg, which is what I did for myself before we started. I'll take some time to teach it to you both later. Pegasi and earth pony mares can use a potion that does the same thing. But you have to use it before you have sex for it to work. Otherwise, the stallion can use a condom. They put it over their penis to keep the semen out of a mare's vagina." Velvet leaned over the edge of the bed and opened her nightstand drawer, and took out a small packet. She always kept a couple on hoof in case they wanted to do butt stuff. Neither of them were fond of stink-dick. She opened the packet and demonstrated how to put one on a penis as she unceremoniously unrolled it onto Night's horn. Night pulled the latex off of his horn and discarded it.

"Some stallions just pull out before they cum- er, ejaculate. But it's not a guaranteed strategy. It's very important that you are both responsible about having sex. Always use contraceptives until you are older, and you're ready to have a foal. But as long as you're safe, and smart about it, sex can be very enjoyable."

"Nngghh!" Shining groaned as he rocked in place on the mattress.

"Dear, are you okay?" Velvet asked. Her eyes followed his as he looked at his penis. It was still very hard.

"It- it's just so... NGH!" he whined.

"Well geez, Hun, just look at what you've been doing to the poor colt. His balls are probably bluer than mine," Night said, not referring to the hue of their respective scrota's fur. Velvet realized that he was right. In the heat of her estrus, the room was practically a heavy miasma of Velvet's arousal. Between that, her giving him half of a hoofjob & blowjob, and the ongoing display before him, Shining was so hard that it hurt.

"Oh, my poor dear! I'm so sorry," Velvet said. "You need an orgasm too. You must be in so much agony right now. Come here. Mommy will make you feel all better." He moved over to her and she got onto her knees to finish felating him.

"No," Shining whined. "I want to do it in here," he said, putting his hoof on her pussy as he laid her down on her back. Velvet glanced over at Night Light. He just shrugged again. In her mind, Velvet knew that there was a point where they should have stopped, and they had clearly passed it. But now all she wanted to do was keep going and see what happens. After all, she'd already had her daughter's arm in her pussy up to the elbow. To say nothing of what Night had done with Cadance. Turnabout was fair play after all.

"Okay Sweetie. If that's where you want to put it," Velvet said, spreading her legs for him. Shining was on her almost immediately, thrusting desperately at her, causing it to simply slide against her pussy and onto her belly. He grew more frustrated and was practically growling. Velvet just held his face with her hooves and cooed to him.

"Shh, shh. Easy now. It's going to be okay soon," she said. She held him still with her hooves as he felt her magic gently grasp his penis. "Back up a little bit?" she coached him. He moved back just a bit and she aimed him downward, running his tip down along her slit. He tried to hump, causing himself to miss again as it slid away. Velvet just ran her hoof through his mane.

"Just relax. Let Mommy help you." She guided him back down again. "Wait for me to tell you." She pushed his tip down along her pussy lips, parting them as she went until he reached the bottom. Velvet wiggled her hips just a bit to make sure that he was lined up properly with her entrance. "Slowly." He tried his best to do as he was told. He slowly pushed his hips forward. After Twilight's hoof, Night Light's penis, and how wet they both were, his tip slipped inside with little resistance.

Shining moaned. His mind could no longer form intelligible words. All that came out were a variety of guttural vowels. His euphoria left him unable to think of anything but the ecstatic sensation he was feeling. His penis was inside a mare's vagina. It was warm, and wet, and soft and wonderful. His hips moved on their own accord, pushing more of his shaft into her.

Velvet just held him as she felt his medial ring pop inside of her. He leaned down closer to her when at last their hips met and his heavy balls rested against her butt. She wrapped her hooves around him and hugged him. His legs kicked at the sheets, desperate to try to get deeper, even as he had already hilted her.

"So good!" he moaned, pressing his face into her shoulder.

"Oh, you're just getting started," Velvet said. "Keep moving, like you saw your father doing." Shining was reluctant to withdraw himself even a single centimeter. He never wanted to leave this place, this feeling. He wanted to stay there forever. Velvet sensed his hesitation and took the initiative, rocking her hips under him, gaining some movement between them. Shining felt the fresh sensation on his penis as she moved around him and it primed his pumping. His hips moved on instinct, humping a bit mindlessly without any finesse or rhythm at first. But with the help of her hooves on his waist, he soon found his stride.

"If Shining gets to have an orgasm, then I want one too." Twilight squealed, looking at her father.

"Wha- well, we can't!" Night said. "You haven't learned the contraception spell, and- and we-"

"Can't you give me an orgasm with oral sex?" she asked. Night looked at Velvet. Velvet raised her eyebrow at Night.

"I don't know. Can you?" Velvet teased Night from under Shining.

"Okay. Fine," Night huffed at Twilight. "Lay down and get comfortable." Twilight did as she was told and laid down right next to her mom on the bed. Night Light moved down between his daughter's legs. Unlike Shining, Night was no amateur to the act of going down on a mare. Even though Velvet had made sure that Twilight took her Beat The Heat potion, it only dulled the ache of the filly's first heat. It didn't eliminate it. He could feel the warmth of her need radiating off of her virgin loins.

Rather than dive right in, he moved slowly and deliberately. He held her legs with his hooves. He worked his way up her thigh so that she could get used to his touch in that general region. He didn't lick her lavender marehood right away. He kissed above it, and on either side, but getting closer with each touch. Twilight squirmed a bit at her father's touch. It felt new and strange, but not bad. She watched him get closer, clearly telegraphing his movements so that his contact never took her by surprise.

But for the grace of her heat potion, Twilight was only a little aware of her feminine ache. But feeling her father's warm breath on her nethers broke right through the dulling effects of the elixir. Until that moment, she did not realize just how much she wanted to be touched there. But now she wanted nothing else but to be touched there. She needed to be touched there. She would not wait another moment. She whimpered desperately and tried to push herself closer to him. Night Light needed no further direction.

"Alright sweetie," he said. He opened his mouth and she gasped as he nearly covered her entire pussy with it. He flattened his tongue and pressed it against her folds. It was at once both too much and not enough for the young mare. He sensed her desperation and began sliding his tongue up and down against her lips, slowly parting them as he pushed it deeper into her.

He deliberately avoided her clitoris and moved down lower to her entrance. He straightened his tongue to probe into her. Talented though his tongue was, it wasn't nearly long enough to get very deep. Twilight hardly seemed to mind. The sensation of him in her was simply driving her wild.

"Show her what only unicorns can do," Velvet suggested. Night grinned and stopped licking Twilight for a second. She pouted and looked down at him. He just bowed his head lower and leaned forward again. Twilight felt the tip of his horn slide smoothly into her. She could feel the texture of his horn's ridged spiral as it moved in and out of her, making her legs tremble on either side of him. "I meant actually using your magic," Velvet said.

"Oh. Well, yeah, that too," he said. Night Light pulled his horn out and went back to licking Twilight and his horn began to glow. Twilight could feel him at her entrance again. It didn't feel like his horn, or his tongue, but rather amorphous. He molded his magic into a vaguely cylinder shape, pushing it inside her. Twilight gasped as she felt the duet of pleasures from the moving penetration and his attentive licking.

"Now pay attention, Dear," Velvet said to Shining, still happily humping away into her. Shining turned his attention towards watching his father going down on Twilight. Night Light lifted Twilight's hips with his hooves as he sat up. He was nearly holding Twilight hanging upside down with just her head and shoulders still resting on the mattress. He licked faster, and Shining could see the blue magic moving in and out of Twilight's pussy just under Night's chin. She panted and moaned as Night angled the magic tendril upwards against Twilight's G-spot. Her moaning grew louder and higher in pitch as her climax approached. Just as she teetered on the precipice, he licked her clit. Twilight cried out as she came. Her pussy trembled and clenched, gushing into Night's mouth with her marecum.

Night Light was taken completely by surprise. Whenever Velvet came, she would get a little wetter. Sometimes she got a lot wetter with a fresh batch of mare nectar. But he had never seen her cum with such explosive ferocity as Twilight. He lost his grip of Twilight and she slipped to the side as she continued to orgasm. Her second gush of marecum arced over at Shining and sprayed him in the face.

Night recovered quickly and put his mouth back over Twilight's pussy and swallowed the rest of her special gift. Shining was drenched in two mares' arousal and thrusted quickly and frantically, a colt desperate to get off without regard for the mare under him. Velvet forgave him. After all, this time wasn't about her. His movements became more erratic as his moaning became louder.

"Remember to pull out when you're about to ejaculate," Velvet said. Shining wrapped his hooves around his mother and held her tighter, intent on doing no such thing. Velvet felt him flare inside her as he pushed it one final time as deep as he could. Velvet felt his penis bumping against her cervix. His wide flare stretched the depths of her vagina, opening her tight cervix by the tiniest amount. He cried out as he started to throb and pulse inside her, flooding her with his pent-up seed. His wide flare kept any from leaking out, quickly filling what meager space remained. He pushed into her again, forcing his cum deeper into her, even as he continued to cum more and more.

"Ngh! Ngh! Gah!" Shining grunted and groaned as he came again and again deep inside of his mother. It was as if the air was let out of a balloon. Shining collapsed on top of Velvet. It was the most incredible feeling he had ever known. He didn't understand why, but amid his labored breathing, he cried into her mane. She just held him, stroking his back with her hoof until his orgasm subsided. Twilight was utterly exhausted from her own orgasm and laid there next to Velvet. Night Light laid down next to his daughter.

"There, there. All better now," Velvet whispered to her son. After a few moments, his weight was starting to smother her. She tapped him on the shoulder. "Come on now, let Mommy get up." Shining shakily lifted himself up, but tried to keep his hips against hers. He wasn't prepared for his penis to leave the warmth of her confines. But his penis betrayed him as his erection wilted and slipped out. He barely had time to mourn the loss before it retreated back into his sheath. His hooves felt weak under him as he flopped onto the bed beside Velvet.

"I'm sorry," Shining panted. "I was inside and it felt so good. I don't know what happened!"

"It's okay. That's what was supposed to happen," Velvet assured him, calm in the knowledge of her contraceptive spell. She brushed his mane with her hoof until he fell asleep. Twilight was likewise passed out beside Night Light. Velvet groaned as she slid off the bed. She used her magic to plug herself, keeping Shining's prodigious load from leaking from her and making even more of a mess. She waddled to the bathroom to clean herself. She looked back at her family laying on the bed. "Class dismissed."