Ponyville library
Check sat, looking at the bookshelf. "Why am I not surprised that when you asked about books, I'd have to help Twilight with her book?" He grumbled.

"Oh my sweet lady." The voice chuckled. "You have yet to really start the round."

Almost on cue Twilight walked in with a stack of books and a large smile. "Celestia just sent more books!" She chimed, levitating one off the top. "I didn't even know she had some of these."

Check went over to the table and gulped at the title of one of the books. At that moment the voice chuckled. "I already looked at one of the books and noticed a potion recipe for a neat potion. Would you mind helping me make it?"

Check looked at her in shock as the voice laughed. "Fine. I'll let this one slide. I thought she would have done more research first."

"Good. Now I hope you don't plan to say no. Because that might end in losing the round." The voice replied. "I'll save my condition for later."

With a deep breath Check nodded, and received an energetic squee from Twilight seconds before she gave him a hug. "Great. I already got everything I need in the lab" She said looking at the book. "And it looks like it'll be easy to make." She said, leading the way down stairs.

Check followed her to her private lab and shivered at the possible implications of what he agreed to. "So… what do you need me to do?"

"According to this. The potion serves two." She explained looking at the book as she levitated the ingredients into a mixing pot. "I don't know why. But it says that one of us should be tied down after drinking."

Check's ear twitched at her words as the voice laughed. "Twilight. I don't think we should make it."

"Too late." She giggled softly, holding up two shot glasses. "Bottoms up." She cheered, shoving one into his mouth as he was about to say something. With a bit of magic encouragement she got him to swallow as she downed her glass. Smacking her lips Twilight started making notes as she looked at the book.

Time seemed to tick by as something started to fill the air slowly, causing Check's eyes to widen in realization. "Twilight? I think you just made liquid lust."

"Don't be silly." She laughed. "Why would… Celestia…" Her eyes fell on Check causing her heart to skip a beat. "On second thought… maybe we should end this now before we…" She froze as Check's hoof pressed against her lips, causing her to realize that she had crossed the room and was about to kiss him.

"I think we know who needs to be tied up. For our own sake." Check replied. Almost instantly Twilight moved to a nearby post and chained herself to it. Check took a deep breath as he battled with his body to walk away.

After a few moments Twilight was becoming visibly uncomfortable and desperate for release. "Looks like it's almost time." The voice teased. Hearing that Check moved to the door.

However as he turned away Twilight got a good view of what hid between his legs. And instantly locked the door with a flick of her magic. "Please. Don't leave me like this."

Gulping, Check looked back to Twilight as she visibly was uncomfortable. "It's probably not a good idea for me to be here. I can see you're uncomfortable about me being here while you're like this and-"

"IF YOU LEAVE IT'LL GET WORSE!" She blurted out before slumping. After taking a deep breath she continued. "The book said that if we're too far apart… the side effects get worse. And we're already at the limit."

"Tell her you're just going to get a drink for the two of you." The voice laughed. "Or sit where you are and enjoy the show. What will you do?"

"Is that your condition?" Check thought back.

"Not at all." The voice chuckled. "I'm holding that for later."

Check sighed and sat facing away from Twilight. However, as time ticked by Twilight's condition only got worse as she paced back and forth muttering to herself in order to try and distract herself. Only stopping to note the elevation of her condition. She knew that Check was likely in as much discomfort as she was. "Check." She gulped. "I don't think we have a choice." She groaned, fearing the next words that were going to come from her mouth. "I… I want you to… fuck me." She whimpered, sounding like Fluttershy.

"Not yet." The voice snickered.

"Try to be strong Twilight. The side effects might take a while but are hopefully temporary." Check called over as he clamped his legs together to try and keep his growing arousal under control.

Twilight blinked as a thought dawned on her. "Are… are you a virgin?" She asked as her body heated up at the thought.

"Well… no… I had a few partners before." He admitted.

"Then what's the matter?"

"I don't want to hurt you." He sighed.

At this news the voice let out a soft gasp. Twilight blinked as her body seemed to scream at her to have the stallion stuff her. "What… what do you mean?" She asked fearfully, though her body on the other hoof seemed eager.

"My last partner… said I was too big." He sighed.

Twilight nearly came at the news as she quickly sat down. "Oh… ummm… well…" her mind trying to come up with a spell to help them. However in her foggy mind state, the only spells that came to mind only seemed to feed her growing hunger. Biting her lip she only came up with one option. "Do it." She sighed.

"What?" He asked as the voice whispered 'wait for it'.

"I want you to…fuck me." She replied in a very Fluttershy toan and volume.

"What?" He asked looking over at her and blinked at seeing her with her flank in the air aimed at him with her tail flagged. 'wait for it'.

"FUCK ME ALREADY!" She cried. "I CAN'T TAKE IT ANY MORE! JUST PUT IT IN ME!" She called as Check looked at her dumbfounded. The voice laughed in complete glee.

Author's Note

It was bound to happen. I was debating on doing StarSwirled instead. But I thought this made more sense this early in the time-line. I'll save a StarSwirled spell for later.