You were so oblivious. Even Shoto knew what was going on!
Katsuki had been asking to train with you about five times a week, something slightly unusual. You had just been gaslighting yourself into thinking he needed more work with your quirk specifically, and agreeing to excessively train with the blond.
He wasn’t horrible to train with, he was rather helpful.. in his own way. He’d guide you sometimes to help your form, he’d teach you anything you’d asked, and be surprisingly gentle with you, even when annoyed.
How could you be so.. clueless?
—
Today was like any day, well.. any day in the last five times this week. Katsuki was behind you, guiding your arms towards a dummy. He was whispering in your ear as he talked to you, adjusting your hands slightly.
You had asked him about a certain move he did involving his arms, and now he was teaching you the ‘correct’ way to do it. Your clueless mind thought he was behind friendly and polite, like there was anything polite about Katsuki’s chest pressed against your back.
“There, good. Just make sure when you apply force not to break your goddamn arm..” He grumps, his slightly flushed face gazing down at yours.