It's Francesca, actually

Francesca got up and pushed 'Miss Nakamura' on to her back. Francesca began to thrust up and down on her in the cowgirl position. Her udders began to leak milk.

"¿Quieres -MOO- un trago de mi -MOO- leche?" Francesca moaned.

'Miss Nakamura' leaned off her back and began to suckle on Francesca's tits. "Oh my gawd, it tastes so good!" Miss Nakamura almost screamed.

"My turn," Jana said as she moved over and lowered her cloaca on to Miss Nakamura's face. She began to eat out Jana right away, with her forked tongue slithering up and down and back and forth, reaching every area imaginable. Her juices lubed up Miss Nakamura's face as her pacing got faster and faster. Jana leaned forward and began to suck on Francesca's tits, squeezing them every so often, putting her on edge every time. The super sweet milk filled Jana's mouth, almost making her cum all over Miss Nakamura's face.

Francesca hopped off and flipped around into the reverse cowgirl position. She continued to pump up and down on Miss Nakamura's double penis. Jana reached around her bovine friend's body and continued to fondle Francesca's breasts, causing her to orgasm. Undeterred, she continued to pump as soon as she had recovered.

Amidst the sweat and grime, Francesca began to sink into Miss Nakamura. Their hooves were among the first to fuse, with her butt becoming glued shortly after. As they fused more and more, Jana began to feel some of Francesca's experiences. Francesca found her back glued to Miss Nakamura's front. Her penises penetrated through Francesca, as she collapsed into Miss Nakamura. She reached down to feel and squeeze her new udders on the front of her body.

Their experiences became one as Miss Nakamura's now bovine face fused into Jana's cloaca. As her face disappeared, Jana felt her face extend as her nose fused with her mouth. Her claws replaced Miss Nakamura's hands and they all fused into a single consciousness. Jana accessed her situation, a lot had happened since she had left school this morning, and besides she was now a taur-looking thing.

Jana conjured up some clothes and made her appearance as a freak of nature socially acceptable, and she exited the classroom.