Ty finally decided that it was time to finally turn into a beast, choosing to become a rhino as well. He groans as the transformation starts, gaining a few feet in height while his muscles grew for him to have a pretty buff figure. Next his skin would harden slightly and turn grey, only growing hair on his ball-sack and legs. Mary masturbates at the sight of Ty changing, wishing she would become a beast like them to experience the kind of pleasure in it.
"Aaauuuggghhh yeesss!!" Ty loudly groans as his face expands into a shape of a rhino's. Two horns grew from his nose as the first one becomes larger than the second. He was in extreme pleasure instead of pain during the whole transformation, feeling his cock expand as well till it was a solid 13 inches in length.
The other rhino sets Mary aside and snorts in a defensive manner, being very cautious as the once boy turns into a rhino like him. Ty lets out a final groan as a tail grows from his upper rear with a small fluff of hair at the end of it, completing his transformation to become a rhino beast of this new chaotic world. He huffs and snorts at the other rhino, both of them grunting and making low groans at one another as they stroke themselves. The space in the closet was now starting to get a little too cramp now, only a couple of feet of space separating the beasts from the walls and door around them.
The two beasts stop masturbating to turn their attention to the young teenager in the small space with them, watching her moan as she goes through a orgasm. Both rhinos shafts become fully erect and throbbing with each heartbeat. The musk that scented the whole janitor's closet was so intoxicating it clouded the minds of the beasts and dissolved their humanity.