Lets break it down so that even you can understand what I meant...
1. Succubus usually need sperm or lifeforce to sustain themselves right ?
- our MC is male and capable of producing sperm right ? Do Succubus care where they get their sustenance from ?
2. If you want to separate paths, you dont make a "prologue" with unavoidable scenes and the tell your "future supporters" this is for story purposes, the rest of the game will be completely separate.
- If your going to have separate paths keep them separate from the start so your different fanbases dont have to sling mud at each other. Its a simple fix to boot...
a) The succubus gets summoned, she needs to feed, MC somewhat uneasily volunteers to let her feed off of him love/lust route
b) The succubus gets summoned, she needs to feed, MC being the wimp he is tells her to go fuck a "real man"... she goes off to fuck the disgusting Russel model... cuck/ntr route
And thats just for that one character that is controversial being a sex demon, for actual love interest or family members the line should be far easier and super clear... The mom for example, in the love/lust route the MC should have a choice to not let her even go on the 1ST DATE, not just stop future ones, not even one !! That's how you separate paths... If she loses her job so be it, there is your challenge on the love/lust route, to make money and help your mom out so you both dont end up on the street.
Forgive me if I left details out, I didnt even play the game, I am going off what posters have said so I cant go into great details... I WAS going to play it as the renders are phenomenal ! And the scene with the Zombie girl looks hilarious, but given the content present that was mentioned by posters I trust, I can tell the game isnt for me.