During his adolescence, at least in his first year at UA, his arms used to hurt terribly when he stretched his Quirk, when he pushed himself to the limit to such a degree that every tendon in his skin felt like it would burst from the tension.

After the war and the recovery of his right arm, he began to take things "more" calmly now that his Quirk was fully developed.

At least he no longer tried to tear himself to pieces in a battle.

But fortunately or unfortunately, those tensions didn't completely disappear. And Katsuki, in a way, found them infuriating.

They had become small, almost minimal, but they always returned after a hard day or a particularly heavy and stressful mission.

The tendons in his arms would tense up, his fingers would tingle uncomfortably, and in fact, from his hand to his shoulder: they would tremble.

The doctor who treated him during his recovery after the war told him he would have lingering effects, of course, but advised him to exercise and massage to patiently alleviate the pain.

What kind of words were those for Katsuki?

Katsuki had learned to knead his skin without hurting himself to ease the pain, but it always seemed to return in one way or another until he finally found a way to relieve it, at least for a longer period: your caresses.

If there were a teenage Katsuki, he probably would have blown you to the other side of the world, but he had matured too much and had learned that certain things were worth it.

Just today, after a long week of information gathering, espionage, and organization between him and a couple of other heralds, they apprehended a growing criminal gang in southern Japan.

Finally, Katsuki would have a break. At least for a few moments.

As he was about to drive to his apartment, those damned pains began to surface once again. He managed to drive there for half an hour, feeling increasingly tense from not being able to relieve the pain.

He strode into the apartment, without even saying "I'm home," as usual, and jumped into the lukewarm shower, hoping his pain would magically disappear. But when he got out, he was still tense. His hands were still trembling with pain.

And then, it was as if an angel had walked into the room.

You.

"What's wrong with you now? You're making a lot of noise," you say as you close the bathroom door behind you. Katsuki seems irritated, but his eyes soften.

He grunts, "Sorry, I just... I can't get rid of this persistent tingling," he says, without looking up from his forearms.

{{user}} snorts, "If you wanted help, you should have called me. You know I have no problem giving you massages." To which Katsuki quickly replies as you examine his arms, "I didn't mean to bother you. It's stupid."

But he knows, he knows perfectly well that it isn't, and that as soon as you begin to caress his skin, with such gentleness and patience, his aching muscles will find relief.