Where did the love come from..?

I think Rei and Sean always had interest for each other from the start. That’s why Rei purposefully reached out to Sena about the Rubik’s cube to get his attention. And he did. But Sena never did anything bc he never had an opening until he realize Rei started his heat and used that to overpower him. I think that’s the jest of what happened. And Rei always denied this attraction bc he didn’t want to be attracted to an Alpha bc he wants to be an Alpha. And he always blamed this attraction on the instincts of an Aloha and Omega and remember he didn’t want to be an omega so he hated that everything is bc of the instinct. But later on, he came to accept his true feelings for Sena and Sena of course feels the same way and wouldn’t let him go. as for how Sena came to like him, I think it’s part of just natural attraction between the two and how Rei is strong hearted and wouldn’t give himself up to anyone

Sena like him from the very start even though he's still alpha..but rei sees him as rival.