A teenage boy is found!

A whimper is heard a few feat off, behind a dumpster. Bonnie approaches quickly, as no on else heard she is alone in investigating the noise. She turns the corner to find a boy, about 19. Hes short, skinny and wearing only some tracksuit bottoms.
Bonnie wanted to talk to him, ask him if he was okay and if she could help, but her new instincts took over and she pushed him against the wall.
The man whimpers again as he is pressed against the wall "p-please don't... p-please..."
She tore off the only clothes he was wearing and grabbed his hips, ignoring his own meager cock, lifting his ass so she could thrust her member inside.
"n-no! i-its to big! it hurts!" he whined, almost tearing up as Bonnie began thrusting, filling every inch of his ass with her mighty ten inch cock.
She moaned out herself as she pulled him up and down with her thrusts, using the boy like a flesh light.
After a few more pumps Bonnie begins cumming, shooting an entire load into the boy.
he started changing immediately, groaning and moaning as his cock grew, his hips widened and a nice pair of tits grew out of his chest.
Despite her instincts having taken over Bonnie feels responsible for this boy now, and decides to keep an eye on him, keep him alive and maybe fuck him again, if she cant find any new meat.