So far that's what's been happening in this game. Clara doesn't seem to go gaga over dicks. Even if her sex life was bad with Alan, she still loved him for who he was. Otherwise, she would have easily left him if she was only obsessed with sex.
That's why I am interested to see her and Leon's relationship since she seems to trust and depend on him gradually. She even got saved more than once by Leon.
On one hand - yup. On the other hand, it seems clear to me like Leon is the Mole/triple agent and is the bad dude at the end of the day.
But, if somehow the author will be able to write a story in a twisting way where Alan brings all the bad stuff upon himself and Leon is the guy who actually tried to redeem himself and make amends...hell, I'd be shocked.
What I dislike in NTR/FemProtag focused games is that they rarely give you an antagonist whose reasons you may see, understand and even cheer for him( and not in a 13 yo "can't wait till he fux her brain out" type of cheers).
But, if the OP doesn't lie, the thing where protagonist can actually win(and not in a "everyone fucked your wife now - here, take what's left of her and have fun with babies" kind of way) his love interest back was the main attraction for me.
NTR as subgenre has way more interesting possibilities and way to motivate the characters than harem/incest stories - that's what brings me to it.
As for the game: so far, it feels like it's a competition between Leon and Alan where Clara is the main trophy. Interesting if someone else could become an LI she ends up with - Harrison, for example.