Himegoto Asobi
Complete | sakuragi yaya | 2011 released
Romance with mature adults. I really love that although the uke is inexperienced with gay sex, but he's been married and had sex with women, so he's not the usual wide-eyed surprised virgin uke. He takes it with humor and is willing and curious about having sex, which is just so nice. I wish more anime had consensual sex like this one, with actual adults who know what they're getting into. I'm not saying teen sex is the worst (though if the age gap is too big it's questionable), I just think it's refreshing to have two consenting adults, it's even sexier that way.
Kakkou no Yume