Author's Notes:

Contains: Realistically-proportioned-Futa Celestia, Impregnation

Written by: Foals Errand

Twilight Sparkle groaned as she walked through the shopping center for what must have been the fifth time. Really it shouldn’t have been this difficult; after all it was only a simple Hearts and Hooves gift for her marefriend. What do you even buy for a mare like Tia though? To say she has everything is putting it mildly! Twilight shook her head at another necklace the jeweler held up. Already she had rejected jewels, toys, and flowers.

Twilight finally left the shopping center empty hooved, her ears pinned back against her head. It was so simple for other mares and stallions to choose gifts for their loved ones, but truly what could she get for a pony so special? Twilight stopped in place a thought coming to mind. Just a few days prior she and Celestia had gone for a walk in the local park. Celestia had seemed distracted though, her eyes following the foals that frolicked around them. She had seemed sad. Twilight had questioned her about it later, but Celestia had simply muttered something about just wishing. Wishing for what though, Twilight wasn’t certain.

Twilight chewed her lip. It was a long shot but if any pony had a chance it was her.

Several hours later found Twilight hard at work in her lab mixing several different vials along with a small amount of her own alicorn magic. Soon she had a small amount of fluorescent pink liquid. “Just enough I’m certain.” She set it beside a similar vial of blue liquid in a padded box before smiling and replacing the lid.

“Happy hearts and hooves day Tia, I had quite the trouble finding anything fitting of you, my love.” Twilight climbed onto her hind legs and captured Celestia’s lips in a chaste kiss which left the larger mare wanting more. She let out a small moan as Twilight’s mouth left hers but shook her head to bring her focus back.

“It seems that you found something though or are my eyes simply imagining that wrapped box. Hmmm?” Celestia reached out with her right fore hoof to gingerly tap the box. Nothing blew up, much to Celestia’s relief. She slowly lifted off the lid revealing the two vials. “Twi? What is this?”

“Well I know that you want a family more than anything so… Happy hearts and hooves day love. The blue is for you, and the pink is for me.” Twilight smiled nervously lifting the vial of pink liquid from the box.

Celestia blinked and licked her lips “I...What does the blue liquid do Twilight?”

Twilight grinned, while a blush covered her face up to her ear tips “Oh well, er it will... very temporary mind you... give you the genitalia of a fully mature and virile stallion while the pink will put me into a very fertile heat. The chances of my not achieving pregnancy due to this are so small I did not even take the time to estimate the odds.”

Celestia stared for several seconds at the small vial of blue liquid before striding quickly to the door and opening it. The two guards outside came to immediate attention. Celestia nodded in response “I want you both to go to opposite ends of the hall and do not approach my chambers until either myself or Princess Twilight Sparkle give you permission, is that understood?”

They both gave a brisk nod with a ‘Yes, your highness’ and did as ordered. Satisfied Celestia closed the door and locked it before smiling at Twilight “Alright, shall we together then?” Celestia uncorked her vial glancing down at Twilight who did the same.

“On three then.” Twilight placed the vial to her lips “Three.” the drink felt like liquid fire as it slid down her throat.Twilight immediately felt the warmth under her tail begin. she let out a small whine as she the feeling expanded in her nethers. It hadn’t been this bad since her first time.

Celestia licked her lips as she finished drinking. The liquid was bitter, but in a good way; salty almost. Celestia quivered a bit; her marehood felt so very sensitive as the gentle solar winds which always surrounded her seemed to tickle at her clitoris. she let out a small moan and stopped the sensitivity causing her to gasp. Curious she glanced down to witness her clit lengthen and expand into a proper sized cock. She shivered as her pussy contracted, expelling two testicles encased within a ball sack. She frowned; her cock seemed smaller than she thought it would have been. She took a deep breath and stopped as a musky scent filled her nostrils. Whatever it was she desired it. Her small cock engorged, standing stiffly as if at attention while she searched for what was giving off that heavenly smell.

Twilight moaned as she laid back on Celestia’s bed, her hoof desperately rubbing her soaking wet pussy hoping for some sort of relief. She opened her eyes with a growl to see Celestia staring down at her. She turned over onto her stomach and lifted her tail, wagging it side to side in desperate hope of attracting Celestia’s attention. After only a moment of frantic waving she felt Celestia’s weight on top of her. “Please oh Harmony I think I made it too strong- ta-take me now! Rut me blind please! I need it, I need you!”

Celestia growled before giving Twilight’s ear a gentle nip “Would be very entertaining if I made you wait my beautiful Twilight… But, I can’t stand being this close and not take you as my mare!” Celestia lifted up from Twilight’s back positioning the head of her stiff dick at the opening of Twilight’s winking pussy, as it continued to leak arousal. With a deep breath, she slammed her cock hard into her beautiful mare.

Twilight’s eyes went wide at the suddenness of the penetration; at once she was thankful for the toys she had experimented with in the past. Even with that practice though this was something entirely new “St-stop please don’t move just give me a moment!”

Celestia stopped, still deep in Twilight’s pussy. She let out small, pained moans, but even in this mad haze she was able to exude some control over her primal functions. After a moment Twilight gave a minuscule nod and Celestia pulled herself almost completely out of Twilight’s trembling pussy before thrusting back in.

Twilight let out a pleasured moan as Celestia slowly thrust in and out of her. She bit into the sheets, shivering as she felt the gentle throbbing of Celestia’s cock. After a moment she realized that throbbing was in fact Celestia’s heartbeat. That fact alone made Twilight shiver with arousal. She thrust back against Celestia, urging her to go faster.

Celestia let out a small snort before thrusting harder and faster into Twilight. Something was building within her that she had never felt before. Without a real thought,she bit down gently on Twilight’s neck for a moment before kissing it. “You are so beautiful.”

Twilight dug her head into the covers releasing tiny pants as she felt her orgasm grow. “Ngh Ti-Tia i’m gonna I-I!”

Celestia’s eyes widened as Twilight’s pussy contracted around her cock.he smaller mare under her let out a small scream which was muffled by the sheets she had been biting on. Celestia thrust harder and faster during the contractions, that feeling of something in her testicles had grown until she felt like they were going to explode. With one final thrust she hilted herself and came what felt like a gallon of cum. Shivering her mane fell flat as if she was drained.

Twilight felt as Celestia came and moaned, the squirts of semen causing her love’s cock to throb within her. After a few blissful moments it ceased and Celestia weakly pulled herself from Twilight’s pussy, even as it seemed intent on keeping her within. A small bit of semen trickled from Twilight’s pussy as Celestia removed herself, but the majority stayed within. Twilight smiled as Celestia curled against her

“How long is this serum supposed to last anyways?” Celestia sleepily asked, her mane covering her as she wrapped herself around Twilight. She licked some of the sweat from Twilight’s coat as a foreleg draped around the smaller mare’s chest.

“Oh um well I’m not sure, I didn’t exactly have a way to test it…” Twilight mumbled, closing her eyes and enjoying the feeling of Celestia’s tongue on the back of her neck. “Why?”

Celestia closed her eyes, giving into the feeling of exhaustion, “no reason really, just wanting to know if I needed to use illusion spell or change my name to Prince Celestia is all.”

Twilight snorted and turned to tell Celestia there was no need to be so hasty when she saw the white mare fast asleep, a peaceful smile on her face. With a smile Twilight kissed her nose and curled up against her “Sleep well love. Let’s dream of our foal.”