Even though everything revolves around sex in this manga, you won't ever find anything gross : the girls' breasts have realistic proportions, and their genitals are never seen clearly (even during fingering and cunnilingus scenes).
As the story progresses, the sex scenes and the situations leading up to them become more diverse and interesting (yes there is a threesome)... eventually we're given an actual romance plot, which serves as a tool for the autor to grab us by the balls and make us beg for something to happen between the shy inexperienced girl and the main girl.
This manga delivers on all its promises ! In fact, once you've read it, you'll probably have a hard time going back to more conventional yuri stories *^*
