【nebi.com】The relationship is written as “sister” and read as “Koibito”.

This is a collection of CGs of two sisters who love their big brother and just love to play with each other in the pool or in their rooms.
The sisters are wearing swimsuits, sometimes swimming suits, micro bikinis, and sometimes naked.
There is a cross-sectional drawing in one of the pictures. Please be careful if you don’t like it.
There are 10 basic CGs, 71 diffs with text, and 23 diffs without text, for a total of 94 CGs.

Introduction of the characters.

Rurika Mizuki
One half of the twin sisters and older sister of Rurika Mizuki. She is a second-year student at a private school. She is concerned about the delay in the development of her breasts. She has loved her brother as a sibling since she was a child, but she recently recognized her own feelings as romantic feelings and became his girlfriend along with Marinatsu. She hasn’t had much experience with sex yet, but she is a healthy girl who tries her best.

Marika Mizuki
One half of the twin sisters of Rurika. She is a second-year student at a private school. She has been a ladylike girl since she was a child, and has always been in love with her older brother as the opposite sex. She has been in love with her brother since she was a little girl, and she became his girlfriend by supporting Rurika’s love. She has a relaxed attitude, but she is actually more lonely than most people.

I
A siscon and pedophile. A new teacher at the school my sisters go to. He thinks that his two younger sisters are more important than anything else in this world.