Ikenai Ayaka Nee-san to Yarisugi Yuuwaku Seikatsu ~Kawaiin Dakara♪ Zenbu Makasete... Genki na Aka-chan Tsukurimasho♪~

She's got the words of a siren and the body of a vixen...
sexy elder sister is too aggressive, and it's wrong!

The protagonist can't handle his sister's sex appeal any more. He decides to live alone. But she still shows up to check on him, and catches him masturbating! His confession cums in a gush... he's always lusted for her, and she confesses the same to him! A kiss becomes a forbidden tangle of sibling incest...

[from DLsite English]