"Nngh... Yukiko!"
"Don't stop, Chie! You're almost there!"
"Yukiko, please...! Before I- Mmgh!"
"I'm sorry, Chie, but this is the only way to fix it!"
"Ah! Ah! Aah!"
Chie couldn't stop thrusting herself in between Yukiko's tits who, likewise, had no intention of halting her breasts' up and down rhythm along Chie's member. Chie's breathing grew shallow, and much more ragged. Slowly, the pressure within her 12 inch horse cock grew too much to bear.
"Ah! Yukiko! I'm-"
"Yes! Keep going!"
"I'm... cumming!"
Her slick, throbbing horsecock had finally been allowed release. Accompanied with the cries of both schoolgirls, the tip of Chie's equine penis shot its contents high into the air, every shot accompanied with a violent thrust, and each more spirited than the one before it. Then, at last, Chie's lust had settled, and the two remained, covered in the still warm juices.
Both girls quietly reveled in the aftermath. Chie, struggling to remain upright, let herself slouch back onto the restroom toilet, completely exhausted. Yukiko, noticing her friend is so completely and utterly spent, stared intently at Chie's penis, looking for any signs of change.
After a couple moments, Yukiko decided to break the silence.
"Hmm, Chie?"
"Hah.. Hah... Yeah?"
"I don't know how to say this without worrying you, but... it's about your... you know."
"What... What about it?"
"Um, it actually looks, well, bigger."
"Nngh... Huh?"
It's then that Chie slowly directs her attention towards Yukiko, only for her to be eclipsed by the massive, pulsating horse cock affixed to her crotch. It's length is not only bigger by at least two inches, but it's girth has grown thick enough to block out the better half of Yukiko's face.
Yukiko, without thinking, uses her hand to push Chie's penis ever so slightly to the side, trying to get a better look at Chie's face. Immediately, Chie winces. "Ah! Yukiko, be careful with that!"
"Oh, oops!" Yukiko laughs, "Sorry about that."
A short pause. And then...
"Actually, Yukiko..."
"Hm? What is it, Chie? Your face is blushing... Are you okay?"
"Well, it's just... Can we... do that again?"