I think it is so obvious that Josy will break up with Maya in a few episodes later. Rusty is a good choice for Josy, because he is such an amazing bro. All he needs a girl like Josy in his life. She is cute, kind, funny, smart, supportive and not 100% if y'know what I mean. She can bring girls to Rusty to have some threesomes. Kinda dream girl for Rusty, don't you think?
About Tommy...I think Rusty is THE ONLY dude he would approve of dating Josy. They are like real brothers. I still don't think Tommy will let MC bang Josy in front of DIKs.
Btw, I hate NTR but BaDIK is not an harem game. So seeing Rusty and Josy together can't count as NTR. Especially for the ppl who don't play trouple route.