As far as scenes with MC and "Mom" - From what I've read in the story so far, it seems at least possible that we might find out that "mom" isn't actually his mother. There have been some hints that they're uncomfortable about telling him something, everyone wants him to end his relationship with his GF, and John treats him like a son (even to the point of calling him "son").
Just my opinion here, and I certainly have no inside information.
Certainly
Even though she might not be his mother the chances of mc being intimate with her seems bleak
She doesn't seem have any sorts of relationship problems(yet) so difficult to pursue her and casual hookups don't make any sense in this situation
One thing about john is that even though he knows mc might not commit to his relationship with her daughter(long distance rel), but also he was very much determined to take mc under his wing,
Just some guesses
- John knows about mc and Nicole but don't mind
-John really screwed someone before his marriage with Nicole and as a result mc (as REAL SON) So now MC's parent knows/came to know about it and don't want incest relationship to be going around and asking mc to breakup with Chloe(?)
- John's corporate mind (Nicole literally admires John's commitment to his work)
Want someone to carry forward his company and mc fortunately happens to be at the right time and right place