If she's already this surprised by a pair of his boxers, one can only imagine the firepower she'll deliver if she discovers his briefs.
The commentary says he's "boxers faction", so he apparently doesn't have any.
Anyway, what I'm wondering is how Shounen Jump Protagonist Oblivious one has to be to keep thinking Kiso's some stoic macho character after all the shrill girly screams she's been giving off, bikini modeling, and breast gropes in the past month or two...
He hasn't really show that behavior in a while. Yeah he's still clueless but he has seen through the charade enough to know there was one.
Sorry to have you help clean up the room.It's been hectic.
I owe you for a lot...Hunh?What is it?
Did that thing come out again?!Ah, my bad.
That's the change of clothes I keep around.Don't worry about it.
Since the insect extermination went so badly, paying you back with cleaning is...HAWAAAA!He-he-he-he-here!It's OK, they're clean.That's not the problem!