Beepy, vampire slayer failure pt. 2 (The Transformation)

Beepy finds the evil vampiress' castle. Thinking seduction will give him the upper hand, he obliges this sexy vamp's advances. They go at it all night, getting a little kinkier as time goes by. Then, he was duped. He falls asleep and wakes up in a cell. He's malnourished to the point of notable muscle mass depletion and now he looks almost.... feminine? The vampiress takes Beepy to her quarters and uses him as her own feminized boy slut. With each butt slutting session, he becomes more vamp like.