1 and 2 are pretty much the same and all depends on if the dev wants Clara to be pregnant, so I would only count that as 1.
What I'm not seeing in any of those is the options to set Clara up with the bad guys for a revenge ending or even Alan getting set up to take the fall. It's ntr so we know there will be an ending for her to betray Alan and set him up to take the fall, seeing the way this story has went and is going I have my doubts about Alan being able to set Clara up as one of the bad guys. Then again I have my doubts about Alan being able to do anything other than be a stupid little wimp who lets everyone walk all over him. I mean honestly wtf is Alan gonna do if Leon ignores him and goes to see Clara again? Go yell at him again, confront them both and see he's been a gullible cuck, spy on them some more, go and tell Clara who ignores his advice and warnings anyways? If he tried to fight him Leon would easily beat his ass. So as much as he seems to be trying to be stronger, he's still the same stupid little wimp who can't do anything. Although now he can go tell mommy that the bad man won't stop seeing/fucking his wife.
IMO, the best way to go is to make 3-4 major endings with sub-branches.
1) They stay together
2) He leaves her
3) She leaves him
And as subs
1.1 Vanilla happy ending. Bad dudes are owned at the end, these two have second honeymoon period
1.2 They stay together, but she cheats. All the pregnancy bullshit with black, orange or green kids is, imo, weird shit for raceplay fanboys.
2.1 He leaves her for Anna, while the bad guys win. Clara becomes regular ho' for whomever wants her
2.2 He leaves her for Anna, while getting the upper hand. Bad guys are defeated, Clara moves on.
3.1 She leaves Alan for Leon. Alan moves on alone. Bad guys win/lose.
3.2 She leaves Alan for Gunnar. Alan moves on alone. Bad guys win/lose.
3.3 She leaves Alan for Harrison. Alan moves on alone. Bad guys win/lose.
3.4 She leaves Alan for Donald. Alan moves on alone. Bad guys win/lose.
3.5 She leaves Alan for anyone willing to insert her penis inside her. Alan moves on alone. Bad guys win/lose.
The best decision would be to make it Fallout-alike type of endings, with 1-2 scenes for each branch/subbranch.
1 for operation, 1 for their relationship, 1 for each subcharacter.
Overall, it would take one long update which may take 6+ months, but I'm fine with that. Don't like the "major" type of endings, where your girl becomes a whore who's hungry for any dick around even if she cheated on you with one guy.
I'd love if Sinful treated each dude who he/she can cheat with as separate love interests, but it probably won't be the case in here, and we'd end up getting 3-5 endings and that's it.