I really, really, REALLY like this. Two people with their heads on straight having a great NSA time, talking about what they like and don't like, asking permission instead of just assuming and actually listening to each other! GOOD. And the art is great too :D
"Sometimes, I just want to have sex without all the baggage that goes with it". Thats the greatest line in hentai history. Loved the artwork and the sex scenes, enough that I really got a hard on. Good stuff Kirihara Yuu.
Casual sex, eh?
They seem to hit it off pretty well, so I'd just suggest they get together already...But hey, if they're happy with this arrangement, that's fine too.