That hasn't been a problem in this game since very few of the girls interest me romantically. It was down to Elspeth and Kana - then Kana jumped the rails with that bizarre sex in Part 5. Now I'm not sure any of them are going to make it to the finish line.
Very disappointing, but it does at least make the logistics simple.
LI's in this game really are strange, I don't think I've ever played a game where, when I was done playing I was like "yea, decent game" but didnt know if I would want the MC to end up with any of the LI's.
Els is obnoxious, weird and everything has to happen on her terms. And on top of that, that pool blue-balling was uncalled for and a total bitch move.
Really liked Kana a lot but you are right, that sex scene was creepy as fuck. It felt like she was using the MC like a sextoy, and the entire thing was super one-sided for a sex scene. She may be salvageable, but it doesn't look good.
Vi and Amrith are better suited as little sister/friends for life to the MC, he depends way too much on them to get better.
Leaves Serena and Ines. Age difference would make Ines a bit iffy, but manageable, she seems to be a really cool girl. Obviously its entirely possible that she also has some demons buried in her past and turns out to be unsuiteable as a gf aswell.
For Serena however it's just lack of content that isn't fucking that's holding her back. She takes care of Vi, seems to be loyal with a good heart and a great friend. I hope we get that date soon that you can agree to waaaaaay back, would love some content other than sex. Right now she seems like the only ( maybe Ines ) viable option I could see the MC end up with.