Eh you're only showing half the story here. So he begins to make love to the chick in this pic and she begins to realize his cocksmanship is superb, making her want the cock more. They get interrupted right as she makes this revelation, shit happens, people die, they can't make love anymore.
Like 10-15 chapters later, long after this scene and a bunch of shit had happened in between, before they part ways she comes to him and asks him to finish what he started. Apparently he did such a good job she was able to look past the whole he's inhuman, he's a demon etc etc.
Not saying he isn't gay though.