Otokonoko☆Revolution

The protagonist began dating a femboy.
When he found out that the femboy had never even masturbated, he decided to teach him about sex through videos and other means.
However, when he saw the femboy getting embarrassed watching a pornographic video, he found himself becoming aroused.

Thinking about doing something to the femboy, the protagonist skillfully convinced him to wear women's underwear and laid him on the bed.
It's only natural for a lover... he said, and began to caress his body.
At first the femboy was flustered, but it seems he had masochistic tendencies, and the more he was teased, the more seductively he began to moan.

And finally...

Minase Haru was in love with the the school's idol Minase Kaoru, who also happened to be his older sister. However, in spite of that, he just couldn't be honest with himself and regretted it every day.

Due to a certain event he found out his sister was actually his brother, cross dressing.

"But I loved her even though she was my sister!"

After hearing that Kaoru accepts all of Haru's feelings........
And the two throw away the boundaries and flirt with each other endlessly.

Where exactly are the siblings going?
To go have sex in cosplay at school of course.

Haru gradually awakes to the joys of traps......

At the end of summer, Rio, Kaoru, and the protagonist head to a villa near the sea. Since it’s off-season for vacations, there’s absolutely no one around. So, under the still hot sun, they expose their tanned skin and decide to spend time completely naked. Dressed like this, there’s really only one thing to do! A vacation for all three together begins.