Think it's also entirely possible that while Rachel and Bella were both absolutely hurt that you were banging them both behind their back but they eventually forgave and agreed on a three-way, but I have my doubts that Liza and mom would be as forgiving, because consider Liza; convincing her to incest is a big feature in itself, but try convincing her to polygamy, think she's monogamous and I think once she falls for you, she falls HARD, MC banging everybody wouldn't be a good look in her eyes
![Stick out tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
And don't get me started on mom, haha, even if you're not on Discreet path, she still wants to be the one in control at least to some extent, the Dom is strong in her, she might be dictating who you can fuck and when, making it essentially her harem, not yours xD