Since Incest is alraedy a major factor in the game, I don't see why not.Firstly, impregnating Collins doesn't have to be bad. DarkDank's point about controlling Collins is fair. Additionally, if the MC is in the kid's life enough, maybe he could eventually teach the child also to dominate Collins as well (not necessarily sexually). That wouldn't be so bad. ("I said, 'Mom', that I'm not going to do that!")
Secondly, I hate to break "bad" news to you, but there is already at least one pregnancy variable being tracked in the game, and it was potentially (depending on choices) incremented with this latest update. So from all signs, pregnancy will be a thing in the game if you make the choices leading to it.
Though if it's a daughter and she's hot, MC could just control her to satisfy him too, there's enough Daddy/Daughter games to show that's a thing.
Morals just don't really come into it in this setting. It could be the love power on daughter and it's still sex. Or if it's a son teach him the domination power for his mom.