One of the prime fantasies of an AGP MtF transsexual is to seduce a straight man. The man serves as a prop to complete the fantasy of being a woman. This is why they hate "chasers" and often hate each other because acknowledgement of transness ruins the fantasy.

Of course then you've got a penis which is a problem. This leads to the somewhat incongruous fantasy element that straight men would love interacting with your penis* and that the MtF is not just a woman but like a woman+. The most attractive girl at the party.

What I'm saying is in addition to the possibility of this story being true, or the possibility of it being pure bait, there's a possibility that it's erotic fiction. Similar to those posts you see of an MtF talking about how they were cat called or hit on or whatever and you look at the profile pic and it's a cartoonishly masculine old man in a dress.

*There may be some factual basis to this. There's an old (pre-evil) google talk about it.