I'm just going to make a comment about the bisexuality of girls.
From my experience, there are several different things that are commonly confused:
A bisexual girl is one who likes to have sex with men or women, together or separately.
There are straight girls who would never sleep with a girl, but in the case of a threesome, they don't mind actively interacting with another girl.
A third group would be straight girls who, in the threesome, will not eat the other girl's pussy, but do not mind if they get eaten by the boy or the girl.
In Spain we have terminology for threesomes that I don't know if it is applicable in English:
Duplex is when the two girls devote themselves exclusively to the guy.
Lesbian threesome is when the girls interact with each other apart from the guy (I know it should be called bisexual threesome, but we Spanish are weird
).
We don't have a name for a threesome where only one girl interacts with the other (we need that name!).
In the game, there will be duplex, lesbian threesomes (optional), and unnamed threesomes (optional).