well first of all, it's fiction so the author probably thought that there's no need since doing it without condom are what most people actually prefer to see because it seems more hot in that way.
I was like: kazu doesnt wash his anus (⊙…⊙ )
it's yaoi, if you read a lot, everyone ass is super clean for some reason and doesn't need any preparation or take a shower first. It's one of the yaoi logic
Yes I do agree with you
Same haha I couldn't stop thinking about it for a while (⊙…⊙ )
My brain through the whole manga: ohmygod they never use a condom