I Was Turned at the Costume Party (interracial transgender menage)

Jamie was a 29 year old who had a long string of girlfriends, yet was still a virgin. At the suggestion of his current live-in girlfriend -- and with her help to transform -- he goes to a costume party dressed as a girl, where he becomes the belle of the ball and attracts the attention of a tall, handsome, black Dracula. He knows who Jamie is, better than she knows herself, and the two sneak off to a private bathroom, so that Lamarr can make Jamie the woman he was born to be.
And that's when there's a knock on the door, and Jamie gets the surprise of her life!