She keeps rubbing the potion on your body and now also on your asshole... it feels warm, your nipples more sensitive... they are bigger and swollen, and at the same time, your cock starts to shrink
You don't know yet, but you have small but beautiful female breasts

She inserts two fingers in your ass, you try to resist, but you can't... so... you beg her, and you explain that you never used your ass before, and you feel uncomfortable...