Oto Love ~Josou Bishounen Gentei!~

The protagonist, Akira, is a second-year student at the private Shozui Academy.
On the day that freshmen begin school, Akira meets two beautiful girls, Meguru and Yuu.
It was a fleeting encounter, but Akira was drawn to them.

It was some time later that he met them again.
When Akira saw Meguru push Yuu down and rub their lower bodies against each other, he realized that they were lovers.

Meguru is a queenly girl, while Yuu is quiet and gentle, but treats Akira coldly.
As he gets to know the girls and becomes attracted to them, he finds out that Meguru's true identity is his younger brother, Ruka, and that the two are a couple...

[From Getchu]