When David finds out that he is a psionic, that turns out to be least of his worries. Because of a biological weapon, it turned 98 percent of the humans into humanoids, and other things, into flesh eaters. It is in this world that he and his friends must survive.
Yes, this is an X-Men fanfiction. But it is mostly about the main character Cougar. He has past that is frighteningly simular to Logan's. I would call this a romance/action story. It will not be really erotic until about chapter five.
If you have not seen the X-men movie, that's ok. The story sort of explains itself as you go along.
