There is only hitsuzen

 Midoriya Inko smelled like wild flowers, like spring rains. She smelled like *home*. By the time Enji had bumped into her, felt his inner Alpha jerk to the front of his mind, he'd already taken Rei as a mate, despite her scent being so cold it burnt his senses.

Rei was optimal to his plan and his future, she'd given him several children already but neither of them was ever truly sated at the end of her heats or his ruts. Rei's quirk, her family line, her pedigree, promised children with power and strength. Perhaps not right away like he'd planned but there was promise there. Touya's quirk was strong, if only his body could keep up.

But there was Midoriya Inko. No pedigree, weak quirk, very pretty with a scent that felt instantly soothing. Like he could bury his face in the crook of her neck, and all the stress and pain would melt away. For the length of one heat he let himself just be, left everything behind in her tiny apartment and lost himself in her scent and taste and for just one week it was glorious. But he couldn't mark her, couldn't bite down on her shoulder like he wanted to for all to see.

In the end, he'd left his card on her kitchen counter and left once the heat was over. He shouldn't have done that much as far as he was concerned.