かすたむ☆しすたぁ～おれチンのいいなり～

Seiya and Yukine finally start to go out after being friends since childhood. While they were shy about it first and had their doubts, their relationship quickly turned into a passionate one and led them explore their sexuality to the fullest... Which even included Amane, older sister of Yukine later on...

Custom Sister Orechin no Iinari allows you to customize Yukine's appearance before you start the game.