"Explain? Explain!?" Shining scoffed at Cadence. "Oh I'd sure love to hear an explanation for this! I know what you are, Face-stealer!" Shining yelled. His horn glowed, slinging a disguise-nullification spell at her that he's learned from his sister, battling the Changeling invasion. The spell hit her and buffeted off without any reaction.

"I'm not a Changeling!" Cadence cried, in annoyance more than anything.

"Well then explain this!" He demanded, pointing at the egg laying on the sheets between her legs. "Ponies don't lay eggs! Wait, do they?" He asked his mother on the bed beside her.

"No, they do not," Velvet answered glibly, still cradling her own newborn amidst the chaos.

"They do not!" Shining repeated.

"Shining- please!" Cadence cried.

"Shining, let her explain. And give the poor filly a minute. She did just finish going through labor," Velvet said. Shining backed off with a huff, grabbing a chair from the desk on the other side of the bedroom, never once taking his eye of the egg or his wife. He carried the chair back over to the bedside as Velvet helped Cadence with a blanket and wrapped the egg with a warm towel.

"So, 'Cadence', if that is your real name-" Shining interrogated.

"You know it's me!"

"Care to explain what this is all about?" he asked. Velvet took the egg, wrapped in the towel and passed it to Cadence to hold. She recoiled and sneered for a second. Velvet didn't press the issue and placed the egg in the second bassinet.

"I'm sure she will, Shining," Velvet said. "But first, can you bring me a cider?" she requested.

"But aren't you going to be breast-feeding?" he asked. She looked down at her drained teats from him suckling earlier.

"Not tonight. And it'll be out of my system tomorrow. Shining, I haven't had a cider in almost a year. And I think we can agree that we're all having a real lousy day," she said. He looked back and forth at the two mares. Cadence nodded in agreement.

"... I'll bring three."
_________________

"So, Flurry Heart huh?" Velvet asked, holding her little filly in her hooves. Cadence nodded.

"It was what we wanted if we had a filly," she said.

"I suppose I don't really get a say in it, since you two will be the ones raising her," she said. "When are you going to make the big announcement to everypony?" He sighed, finishing his drink.

"I guess as soon as this all blows over." She motioned to herself and the egg.

Cadie," Shining walked over to her, passing her and his mother each a mug. "I'm sorry I yelled and called you a face-stealer."

"I'm sorry too." she said. Cadence made her way over to the coffee table, settling down beside Velvet on the sofa.

"Hey sweetie," Velvet said, putting her hoof on hers. "How are you holding up?" Cadence looked over at her. Her mane was a fright, her eyes were puffy and red.

"I've had better days, you know?" she said. Velvet let out a quick chuckle. Cadence joined her in the moment of levity they both desperately needed. "Oof." she moaned.

"What's the matter?" Velvet asked.

"It's these things." She pointed at her teats. They hadn't received the recent attention that Velvet's had enjoyed. They both appeared quite full.

"Have you not milked them today?" Velvet asked the obvious. Cadence shook her head. Velvet lifted the foal from the crib.

"Here, why don't you feed Flurry Heart? I'm sure she could use it. And it'll be great to help you bond." Cadence rested on her side, taking the foal to her. She instinctively suckled as Cadence held her to her teat. All of her fears and doubts seemed to fade from her mind as she looked down at the foal in her hooves. And in that moment she felt that no matter what came of tonight, that-

"You're going to do fine," Velvet said, reassuring her as though she could read her thoughts. "You're already a natural."

Shining sat quietly, just watching Cadence feed little Flurry. He looked at his wife. Her mane was a fright, her eyes were puffy and red. And she was beautiful, feeding his daughter. By the time the tiny filly had her fill, Cadence was feeling much better.

Cadence set the sleeping filly back in her bassinet and sat back on the couch, her teats no longer uncomfortably full. Cadence picked up her mug for a drink. "Oh, what a relief it is," Velvet said, knowingly, taping Cadence's mug with hers, each taking a sip. Cadence took a longer sip. And then another.

"Ahhh," Cadence sighed in satisfaction. She looked at the other two ponies. "I guess I owe you an explanation. I had always meant to tell you, Shiny, but I was always afraid to." He reached over and put his hoof on hers. "It was back before the wedding, obviously," she began, "it was right after the threat had been made against Canterlot."

"I remember that night. Everypony had been recalled back to the barracks. I ended up being out on patrol all evening!" Shining said.

"I thought you were going to be, too," Cadence continued. "But you- well, what I thought was you, came home shortly after you left. And wanted to show me something. A big romantic gesture! She looked just like you."

"Baby, it's not your fault," he said. "She fooled all of us." She wiped her eyes again, regaining her composure.

"I know," she said. "And then she brought me down to the caves beneath Canterlot. They were beautiful, but it was dark and scary. But I felt safe because I thought I was with you." She drank some more of her cider. "But every now and then I'd catch a glimpse of something in the reflections of the gems. I thought it was my imagination running away on me. We got to a small alcove at the end of the mine and that was where... that was when..."

"Shh... you don't have to say it." Shining said.

"She took me right then and there, with your body. I could see something in the crystals. There were two of them, opposite eachother, like one of those infinite mirror tunnels? And in the reflection of the reflection, I could see her true form!"

"She could see me looking at her but she didn't stop. She just smiled at me with that awful smile. I felt her change inside me. When she finished, it didn't feel like when you normally cum." She paused for a minute. "I talked to Twilight about Changelings afterwards. And she told me that they have an ovipositor."

"A what?" Shining asked

"It's like a penis, that lays an egg. Twilight said that Changelings are a species of parasitic xenomorphs. They can't reproduce on their own. They need a host to incubate their eggs." Cadence finished her cider. "For a long time after that, I was afraid I was going to lay an egg. But I never did. Until tonight."

"So that was why you were having trouble getting pregnant?" Shining said.

"I never thought of that. But I guess the fertility potion must have been what finally let you fertilize her egg." She tapped her chin with her hoof. "But the worst part about all of it was that when she finished, she took my form and trapped me in the caves. She vowed that your first foal would be hers. But I thought she that meant that she was disguised as me and she was going to..." she trailed off for a moment, looking at Shining, "mate with you." She looked over into the bassinet. "But I guess she got the last laugh after all." Cadence sighed and finished the mug of cider. The three of them sat quietly for a while, none knowing what to say. The silence, punctuated only by the occasional murmur from little Flurry, stirring in her crib. Then Shining sat upright suddenly.

"No! She didn't!" he said with a start. "Cadie, don't you see? We can look at this as a defeat or a blessing! The Queen didn't win. We did!" He moved over to the egg. "This changeling isn't one of her hive. It'll be ours. An ally to Equestria!" He grinned.

"Shining, I don't know," Cadence said hesitantly. "I understand that you want to love it. It's half your foal. But it was the Queen's egg. I was just its... first apartment."

"No, Cadence," he got down on his knee in front of her, holding her hoof. "We can raise this changeling as one of ours. Just as Twilight raised a would-be-dangerous dragon, as an ally, a friend. So too can we." He stood and picked up the egg from the bassinet, holding it in his hooves. "Just imagine! A changeling in the royal guard! He would be the ultimate infiltrator!" He lifted the egg up. "Stormageddon, the spy!"

"Shining, harbor whatever illusions you will, but we are never naming anything that!" Cadence said. "Not even a house plant. That is just... the worst."

"No! It's too late! Stormageddon!" he repeated, smiling as he cradled the egg. "My son, Stormageddon!" Cadence did not share his enthusiasm. She crossed her hooves in protest.

"Whatever comes out of that egg will not be my foal." She huffed. Shining put the egg back in the bassinet.

"Cadence, we can't undo what Chrysalis did." He said. "All we can do now is make the best of the hoof we've been dealt. The Queen may have provided the egg, but this will NOT be her offspring. She didn't carry it for eleven months. She didn't give birth to it. She won't be around to raise it. YOU will! You've already done the hardest tasks for this one, not her. You are more his mother than she'll ever be!" He could see that she was considering his words. "Look, I don't expect you to love the idea right away, but maybe, if you give it a chance, you could one day?" She thought about it for a moment and nodded. "Well, it's a start."

"I suppose now that you're not pregnant anymore, you'll have to make the big announcement to the empire." Velvet said. "Introduce everypony to Princess Flurry Heart."

"That can wait a few days," Cadence said. "What about you?" she asked Velvet.

"Well, now that I'm no longer expecting, I'll be expected back home in Canterlot," She said.

"What about..." Cadence motioned to Velvet's remaining baby weight.

"Eh, too much of the local cuisine." She said.

"And those?" Shining pointed to her teats, still enlarged for nursing.

"New, exotic foods do strange things to a mare," she said with a straight poker face.

"He, he." Shining chuckled.

"What's funny?" Velvet asked.

"Stormageddon the Changeling Spy," he said aloud. "Hey, you know what this calls for? A Spin Off!" He ran out of the room.

"What?" Cadence called after him.

"A Spin Off!" he yelled from the kitchen. He trotted back in with a bottle of champagne, pointing at the cap in lieu of a cork.

"You mean a twist-off?" Cadence asked.

"Yeah, whatever," he said, opening the bottle in celebration. "Hmm, I wonder how Dad is doing..."

Twilight Sparkle walked up the steps to her foalhood home. She'd been so busy in Ponyville over the past couple of years that she had barely visited her parents. Even less so, now that she was a princess with so many new responsibilities. She'd already forgotten to visit for her mother's birthday. She would not make the same mistake for her father. She knocked at the door and waited a while. After a few moment, her dad finally opened the door.

"Hi Dad!" she said and she leaped forward to hug him. He was surprised at first but hugged her back. After a moment of embrace she let go. He took a step back inviting her inside. It was then that she got her first really good look at him. His fur was scruff, and his mane was disheveled. He looked tired, unkempt. "Dad, are you okay?"

"Yeah, uh, yeah I'm fine." He scratched the back of his neck and tried to surreptitiously straighten his mane out. It didn't go without notice. "I just wasn't expecting anypony today."

"Really?" she asked.

"Yeah. Why?" he asked. Her father was many things, but a good liar he was not. Twilight could tell that he honestly had no idea why she was there.

"Dad, it's Father's Day!" she said. He looked at her strangely and ducked back inside looking at the calendar.

"Is it really June already?"

"Yeah, it's been June for like, two weeks." She said. He looked even more confused. "Dad, are you sure you're okay? Where's Mom?"

"Probably having an affair." He mumbled a bit too loudly.

"What!?" Twilight shouted.

"No! I- I don't know exactly," he stammered. "She's been traveling for her publisher. All over Equestria. And it's just-"

"Just what?"

"It's just nothing. I'm probably just over-reacting," he said.

"But?" Twilight asked, leading him. He looked at her. She wasn't a little filly anymore. It was times like these that he was talking about, when he would tell her that she was too smart for her own good. But he could tell that she could see right through him.

"But... for the last few years, there have been a lot of 'long weekends' and trips to other cities and 'work assignments' that she seemed to look forward to way too much. And she would always come back with that sort of afterglow. You know?"

"You think Mom is cheating on you?" Twilight gasped.

"She must be," he said.

"But how can you be so certain?" she asked. Night Light sat at the kitchen table and cleared a space in the mess for a drink, grabbing himself a glass and a bottle of Applejack Daniels.

"Last year, I was taking out the trash, and the bag ripped on the railing. I was cleaning up the mess and putting it in the bin, and I found a pregnancy tester box." He poured himself a glass. "I had a vasectomy after you were born, so there would have been no reason for her to have needed that."

"I- I can't believe Mom would do that to you! What is wrong with her!?"

"Now Twilight, stop!" he said, putting his hoof up. "It's not her fault."

"How is it not her fault?"

"She's- she's a mare of flesh and blood. A mare with needs. And I-" He frowned and sank into his seat.

"What? What's wrong?"

"And I can't meet them. Physically." He admitted. His expression was a mixture of embarrassment and shame. Twilight tried to stay level.

"Dad, listen, I know you're getting older. But there are potions you can use to help... your royal guard salute." She said with the best euphemism she could think of.

"No, it's not that," he said. "It works, it's just... small."

"Small?"

"Yeah. Small. Like, really below average," he said.

"Dad, a micro-penis is a real disability, and it's not your fault. In fact-"

"No, no, it's not that bad," he said defensively. "It's just- enough to be embarrassing." He went to pick up his glass. Twilight put her hoof on top of it, slamming it back down on the table.

"Show me." She said. Night Light leaned back in shock at the request, his eyes going wide.

"Um, no?" he said.

"Why?" she asked.

"Because it would be weird!" he said. Twilight rolled her eyes.

"Dad, you used to change my diapers. You've seen my vagina plenty of times. Was that weird?" she asked.

"That was different. We're both adults now," he said.

"Yeah? Well one of us is acting very childish," she said. She stood up and turned around, lifting her tail, flagging at him and showing off her marehood. Nightlight reflexively tried to look away, but found that he could not. Daughter or not, it was the only pussy he'd seen since Velvet had left almost a year ago. It glistened with her juices and her tail wafted her aroma at him. All too quickly she sat back down. "There. You've seen my genitals. Now they're old news. So why don't you just- oh, okay, here we go." Night Light didn't realize it at first, but seeing her like that was having more of an effect on him than he knew. His shaft began to emerge from his sheath. He tried to cross his legs and turn away, afraid to admit that she had turned him on so.

"Twilight?! What are you- are you?-" He tripped over the words. Twilight could see his nostrils flaring reflexively as his breath grew ragged.

"What?" She looked down at her own flank. "Oh, yes. Well it is April. I must be getting into season." She turned her attention back to him. "But enough about me..." She grabbed his chair and turned it back to her. He had become fully extended, hanging low. "Does it get any bigger?" she asked.

"You know, every time I hear that question, it doesn't get any easier," he replied. Twilight thought about what she'd asked and realized what it sounded like.

"No! No! I didn't mean anything by it!" she said. "I'm just honestly asking." Night Light looked down at her as she leaned in closer. He could tell that she was dead set on this, and there could be no dissuading her.

"Uh, no, it gets a little bit bigger when it gets harder," he said as matter-of-factly as he could. He stilled tried to squirm away. "Come on Twi, I know you've studied pony anatomy. You know this."

"Yeah, but I've never seen it," she said.

"Yeah, well the show's over now so- wait what?" he asked.

"I've never seen one, well, outside of a diagram in a book," she explained. "Can you make it harder? Do you need to see my pussy again?"

"I uh-" Before he could even comprehend what she'd just said, Twilight was on her hooves again, with her tail lifted and her butt pointed at his face, closer this time.

"Is it close enough for you to smell?" she asked. If he leaned forward mere inches, it would have been close enough to taste. Twilight could see the effect immediately as his penis stiffened and pointed skyward, throbbing hard with each of Night Light's rapid heartbeats. "Ah, there we go," she said. She trotted over to the kitchen drawer, full of all sorts of random junk. She found what she was looking for quickly. A measuring tape. "Okay, now hold still." Before Night Light could even object, she took grasp of his penis in her hooves and held the measuring tape in place, measuring the length and the circumference. She made a mental note of the values.

"Well, it looks pretty big to me," she said at last, still holding onto it, moving it from side to side, inspecting it from every angle. "These too," she said, cupping his balls in her hooves. "Any mare would be lucky to be able to have this inside her," Twilight said, playing with it a bit more, stroking the length.

"I wish you're mother thought that." Night Light said through his teeth, trying to keep his composure as his daughter jacked him off.

"Mom doesn't know what she's missing, then," she said.

"Twi, you ugh- you ahh, need to stop thaaahht." He said. Twilight looked at her hoof and realized what she must have been doing to him.

"Oh my gosh, I didn't even realize!" she said. "Are you going to ejaculate?" She sounded more excited than she ought to have. "Will it be a lot?"

"YES! I mean no! I mean- please let goooooOOOOOHHH MY GOSH!" he cried out as he felt himself go past the point of no return. Night Light's first spurt shot straight up, landing on his daughter's horn. Twilight instinctively looked up as the second glob landed on her nose, and the third on her upper lip. She let go of him and it slapped against his belly, spent of it's load. Twilight reflexively licked her lip, tasting her father's semen.

"Hmm, interesting taste," she commented. "But I wasn't ready. Let me get my graduated cylinder from my bag so I can measure it. Can you ejaculate for me again?" Night Light's head was spinning. It had been a long time since anypony had touched him like that. He came even faster than normal after so long of a dry spell. But this was his daughter! She flagged her tail at him again, her clit winking at him as she rummaged through her bag.

"Twilight, no! We can't be doing this! I've already let this go too far," he said sternly. "You're my daughter!" She rolled her eyes.

"Would you relax?" She backed up toward him, touching his snout with her nethers. "Here, think about something else," she said as she sat back down on the floor, getting her measuring instruments ready. He licked his face where her wetness was on him. She could see him getting hard again already.

"Twilight I-"

"Now, now. I tasted you, so it's only fair," she said, "you can thank me after."

"After what?" he asked. Her reply was only taking grasp of his dick again and stroking it as she pointed the tip at the opening to the graduated cylinder. "Twilight!" He shouted.

"Relax, I said. It's for science!" she said. Her hooves on him felt incredible. Her taste lingered on his tongue. His mind became fogged, overcome with her arousal, and his own.

"Well... if it's for science..." he finally relented. "... could you go a little faster?"

Author's Notes:

To be concluded!

Twilight's Night Light

Stormageddon: Changeling Spy