[@Ryonara] [@SimpleWriter]

Can I make a suggeston? Instead of having the reinforcement actively damage him, why not a simple debuff to counterbalance the simple buff he's giving to the object he's touching? IE, while his quirk is reinforcing something, he himself is much more vulnerable to damage; he'll bruise more severely when struck, he'll bleed more profusely if cut, and it makes him more sensitive to pain in general. You can even take this to further levels if reinforcing larger objects or prolonging the reinforcement past the usual time limit takes more effort on the part of his quirk; he'll start becoming more sensitive to light and sound, and even changes in air pressure. It could even affect his immune system. :)

This way, reinforcing things still provides a risk to himself, which forces him to be more careful with it and dissuades him from using it on one thing for too long, while also playing into the theme of his quirk. Thoughts?