Transformation

"well you see every time I fuck a man I steal their sexuality, so if if you willingly let me fuck either of your two tight holes then you become less manly and more feminine. Swallowing my cum seals the deal and turns your pathetic little pecker into a nice, moist tight pussy."

"Wait how do you fuck me you're a girl" you point out.

"It works both ways silly as you become a weak little bitch I become a strong man. However once I cum and you swallow it's sealed no going back understood?"