Other tags: hot, pain-free sex, mature relationship, premature ejaculation, heartwarming, slice of life, beautiful art. A really unusual yaoi in 2007, non-stereotypical, actual healthy relationship and mutually pleasurable sex, mature adults, wholesome, three-dimensional characters, etc. Also, I really loved something about this mangaka's kissing and sex scenes, they weren't explicit but I felt the genuine chemistry and passion between them.
Kouun No Rihatsushi