I agree and thats why I typically wait at least every other update or 2 before I go back and play. This just falls into the category of games I play where sadly this is the case, despite the regular updates.
As for the MC, I can sort of see his point of view, he is already having an incestual relationship with Lilly while also dating Maya. For once, our MC isn't a scumbag degenerate perv...well at least not for always being the one to initiate things. I do like seeing the girl(s) every once in a while be the ones with a perverted taboo kink, and funny enough, it looks like Lilly takes after her aunt Christine, while Rachel is closer to Tasha. Anyway, despite having very strong feelings for Rachel...even more than Lilly since they were closer, he does not want to scare her away or do anything to ruin their relationship. Yes I know the car scene happened, but that can still be best described as a happy accident. In which case, if Lilly wants to be the instigator in creating a family harem, it falls on her to gauge how Rachel feels about continuing down this path and allowing herself to be seduced/convinced to give in to her desires.
Given all the flirty banter Christine has said regarding her view on incest, I assumed she would be the next conquest for the MC and another person to try and ease Rachel into completely giving in. To be honest, despite Christine's conversation with Tasha about her niece and nephew possibly having sex, and Tasha's sarcastic reply, I think it goes without saying Tasha will very likely be the last conquest and hold out the longest before finally giving in...so that means its going to realistically be another year at this pace before we get to see any lewds with her and the MC.