Skirt no Naka wa Kedamono deshita.

Both anime are very short but they get straight to the hentai point with both the female protagonist being very weak against their "attacker." Both anime has the same vibe as to the sexual scenes, being straight to the point. 

Both have the same Hentai/ ecchi kind of thing, where it involves guy and girl getting to know each other, if you know what I mean, excep how the guy get's tp please the girls were pretty much diffrent. 

Both being stories with adult content, episodes no more long than 5 minutes, has the same theme of a guy dominating a girl. 

Short episodes and has similar context of a girl being taken by a guy with a H theme. 

Yuri anime, but with a surprise. Maybe romantic drama is a bit overrated in Skirt no Naka wa Kedamono Deshita. 

Hot romantic action anime, if you know what it means. 

Both series have these similarities: - A girl with little experience with men - A transvestite boy, who captures the girl's attention. - The girl must keep the boy's secret, since it is in a way a person known by the means. There is a clear difference between a comedy series and a hentai. But as we go through the chapters, we see that the two protagonists get to know each other better, knowing the other's weaknesses, thus changing their ways of thinking. 

Both animes are josei romance, like hentai for women, with handsome guys and sex "focus" on woman's pleasure  

The coincidences are infinite: - Girl who does not succeed in sympathizing with men is harassed by one. One of them must hide the other's secret, they do so to escape their fears. They will get to know each other better, understanding each other. Knowing that they will always be there to help each other, despite confusing feelings. 

For reasons of fate, they gathered them together: A girl / boy who is afraid of being with a person of the opposite sex who dresses as if he were of the same sex. Both will get to know each other, discovering and gradually eliminating their weaknesses, insecurities that prevent them from being together.