The full moon came up, and the two cursed humans braced themselves to become two cursed ponies.
Jeri changed first, his iris turning red and his hands bloating up and fingers shriveling away. Blue fur began to cover him next, followed by his hair growing out and turning red. He shrunk in size, his under where (the only article of clothing he didn't take off before hand) fell off, and the world spinning significantly less than the first time, now that he'd grown accustomed to it. A small groan of pleasure escaped his newly forming muzzle. His tail grew out, and finally his cutie mark appeared on his flank. Shaking his head a little to fix his mane, his transformation was complete.
"I... I don't know about this." Charles said, nervously.
"It's not like you have a choice anymore, you already made it." Jeri said, dropping onto all fours. Charles groaned, from annoyance, and from the curse beginning to kick in. He began to grin as the pleasure grew stronger.
"Whoa... this feels... niiiice." Charles sighed, his eyes glossing over and turning red.
"Yeah... it does do that." Jeri chuckled. Charles didn't hear him. He fell onto all fours with a crack of his spine. His red tail pushed down his boxers, and orange fur began to sweep over his body causing him to noticeably shiver.
"This... is so goooood!" Charles exclaimed, throwing back his head in pure bliss. Through his smile, Jeri was able to see fangs growing.
"Umm... Stella! He's growing fangs, should we be worried?" Jeri asked through the bathroom door.
"He's probably turning into a thestral." Stella called back. "A bat pony." This was affirmed when two bat wings sprouted from his back. The fur seeped over his face, causing it to push out into a muzzle. His transformation was complete.
Charles stood there for a moment, groaning happily.
"Charles? Snap out of it." Jeri chuckled to his friend, nudging him a few times. Charles shook his head, and looked down at his hooves.
"I'm... I'm a pony! OH MY GOSH I'M A PONY!" He cheered, jumping around happily. Jeri looked down, and noticed a puddle on the floor.
"Umm... Charles?"
"Yes?" Charles replied, oblivious to the puddle.
"Did you just... pee yourself?" Jeri asked, internally cursing his pony dialect for not allowing him to say "piss." Charles stopped bouncing mid air, and hovered relatively slowly downward.
"I... don't think so?" Charles lied.
"You're soaked boxers say otherwise." Jeri pointed out.
"Shut up! Don't make me suck your blood!" Charles voice-cracked. He stormed out of the bathroom, only to fall on his face in the door frame.
"Oh my, I'm so scared!" Jeri exclaimed sarcastically, laughing as he exited the room.