That's not going to happen ever in this game. He's the most standard character of an incest game, and even more important in this case considering MC is a mother who needs a son for the most traditional incest relationship anyone could expect. The mother-son incest is far more common than the mother-daughter.That's not whining & being annoying. It's Dylan who whines & annoys, (as do his multiple facepalming fans). Personally, I wish some paying fans would start pushing back against the 'Dylanisation' of this story, because he's getting out of hand. There's only one way I will ever like him & that's when he stops trying to shag his own mother. I can't wait to get him hooked up with a proper girlfriend & that's in Dylan's best long-term interests also.
It doesn't mean you can't get rid of him. As long as L&P offers ways to do that without having too many side effects on other paths (you're bound to lose many filthy points if you send Dylan to hell), everything should be ok.