I think it's not because he didn't rape him, but because he cared enough to help. A lot of people will see a stranger having a hard time and ignore it because they think it's a hassle, but seme didn't think twice before helping him
Well, if u say it that way then it will make sense. But we're talking about omegaverse, rape is like normalize in that concept because of their urges, animal instinct, and pheromone bullshit. So if we like go with this kind of logic, people who don't rape an omega in heat r rare and is above the bar and normalcy.
And also what she ^^ said, i think the fact that he didn't get rape was only a stepping stone, the rest, getting helped, not being taken advantage of, is enough to make a person fall in loved with them.
the bar was so low he fell in love because the alpha chose to do the bare minimum and not rape him