I mean, I was going for "help me wash my hair" too, or I could just hang over the sink as well. Why do you think I haven't put my shirt back on yet? You think I'm trying to show off what you've grown up with?

[There's a playful glint in his eyes, keeping up with his distraction attempts and being as light-hearted as he can despite him being the cause of Iwaizumi's doubts at the moment. This is the least he can do at the moment.]

As long as you don't try to drown me, you can mess up my hair as much as you want to.

[Rare, that he was allowing for anyone to mess up his hair like that, even rarer that he offered. But he knows it's a situation where it's better to loosen up than be wound up.]