I think this is part of why I dislike Jeremy so much. He isn't a real character he's just a hollow vehicle for a bbc fetish. Even Tyrone had something else going for him while also filling the same fetish and gggb was less grounded.
I don't think Jeremy had to be a totally bankrupt character, if Eva had written him to have some actual standards I'd be more sympathetic to him and his little trial of trying to be a playa.
For one he should have clarified his relationship with Louise instead of trying to have his cake and eat it too with her and Ivy, or at the very least he should do so at the players prompting it. Secondly he should not succumb to pressure and let Lena perform sexual services on him at the bottle-game when she's with Ian and ideally he should have carried a harsher tone with Ian after catching him with Cindy. I get that he's a friend, but not going after the ladies of your friends is a mantra he claims himself.
If Jeremy had lived up to his own idea of a what a "playa" is, I wouldn't find him so pathetic and be more inclined to play for his content, assuming that could have happened without it being at Louise's expense.
But at that point I'd be essentially dealing with a whole other character, I just don't get why other players find him an attractive prospect.
Was any reason given for Billy turning white?
I don't think there was a direct statement. But it happened right after Alison got the threesome with him and Jeremy, the player base was talking about it as Alison going on the BBC route that the Eva character had in GGGB and most took the change to mean that Eva wanted to discourage that impression.
Hopefully for the dev's next game she can do a black guy character better than just bbc fuel. And hopefully he isn't so stereotypical and isn't focused on rap, sports or the size of his penis.
I don't really mind if they partake in a kink like that, any potential future characters of African origin, but ideally there is more to them than just their race. People were kinda into Marcel/Holly because of the way he acted with her, they're on the surface a funny coupling, it was not just because he's black.