"Oooo Katie this feels... it's so... hard!" Tiffany exclaimed as the erection finally registered in her brain after the initial shock of the transformation wore off. Her hands immediately went down to rub her new donkey dick.
Katie's jaw veritable dropped as she watched her friend masturbating her huge donkey dick.
"Tiffany don't! You don't know..." Katie tried to stop her friend, but it was too late. Tiffany was stroking herself with increasing urgency. Her tail lashed back and forth, and her balls swayed with every stroke. Tiffany was consumed by these strange new feelings stemming from her new genitals. Testosterone flooded her teenage body, overwhelming her and transforming her further.
As Tiffany pumped her cock, her breasts began to disappear. Slowly the shrank back into her chest, until she was left with hard pecs. Her body got hairier in all the places a guy would have hair. Her arm pits, her legs, and her crotch. Her cock and balls now had a decent layer of black pubs covering their bases. Katie stood in shock as her friend had not only turned into some weird donkey creature, but the opposite gender.
Tiffany's balls pulled tight, clenching almost, and then she came. All over Katie. Cum hit Katie's chest, her legs, her face, everything. She was drenched in the thick, yellow-ish spunk. When thick chunks hit her, and Katie tried to back up to avoid getting hit. But the damage was done.
While taking deep breaths to calm down, Tiffany failed to realize she was making quiet "hee-haw" noises. Or that she was no longer a she. Katie stood completely stunned and grossed out, covered in cum. She tried to speak, but cum dripped down into her mouth. She gagged at first, but the salty taste wasn't that bad...