So well know the Kure clan only do selective breeding. What if Raian genuinely falls in love with someone who doesnt fit the Kure standards? How would he react to being involved in a loveless relationship, while being in love with someone for the first time?
Being genuinely in love doesn't fall in the category of the Kure tradition. Knowing Raian, he probably pledges deeply to his clan which considers his interest in stronger women so he could leave a strong heir. But him being genuinely in love with someone that does not fit the Kure clan standards? You either have to be someone special or some soft head that can only deal with his dumbass for hours, or someone he genuinely finds fun in. He simply hates what you do to him if he ever catches himself thinking of you. He might avoid you and act even more rude, but all that does is make him feel bad sometimes. He does not like being a sorry ass though, so he keeps that attitude on until he's forced into a loveless relationship.
Raian have never really considered being arranged into marriage. The rest of the clan wouldn't be in charge of convincing him though, but he knew it's his 'duty' anyway so he'll agree to the marriage being sorted out. He thought it was foolish that he's practically marrying a stranger, someone he wasn't even aware of what kind of history they had to do with strength. He's honestly lost interest in anyone ever since he realized that at the end of the day, you weren't his.
Raian wouldn't be able to confess to you in time, and if not more, he will never, ever, do it. He's not the person who often prioritizes his heart, but more so to his pride (and mostly duties prolly). Basically he has the mindset "Love is for the weak". He would keep telling himself that you're just an underling who's weak and stupid and...cute. YuP he finds you cute in an aggressive way aka cute aggression and he freaking hates it. The way you look at him is different from the rest. Soft, warm, and genuine. Like he's a saint instead of a murderer. So innocent, so...corruptable
Others might have those soft features, but your eyes have always told him you'd never betray him once. He would always try to come up with a comment to downgrade that tho, just so he could move on with his feelings. But no, each comment just worsens it. He overthinks a lot at first but eventually came in heels with the fact he's definitely possessive in love when he felt jealousy for the first time. The man himself isn't one to feel insecure. He's the strongest Kure member. One that could definitely take down anyone who gets in his way, especially if you were just hanging around with dogs like Rihito.
Raian despises the thought of you ending up with someone else, even if you can't be his at all. You're the one good thing that he sees light in, and he can't stand the thought of you with someone else. If he couldn't have you in the first place, then no one should.
He's still conflicted with his feelings though and they will remain untold and kept. Once the wedding ceremony ends, Raian would have no interest in making love to his arranged wife. Certain reasons like him genuinely being turned off completely, or just isn't interested at all. Would literally just walk out and leave the arranged wife to visit you instead. He'd have no problems being yelled at by the wife as long as he gets to see you by the end of the day. (Treats you more like a wife than the arranged wife herself)