https://www.dlsite.com/maniax/work/=/product_id/RJ285959.html

https://www.melonbooks.co.jp/detail/detail.php?product_id=648283

[Synopsis]
Third-year student "Miyamae Honoka" and teacher "Kiryu Ryoma" are cousins ​​and are very close.
They kept their relationship a secret from each other at school because they might be transferred if the people around them found out.
Miyamae, who has feelings for Kiryu, often goes to Kiryu's house, who lives alone in the neighborhood to show her affection but he doesn't make a move...
One day, Miyamae's parents have a fight and it's uncomfortable to stay at home, so she stays at Kiryu's house longer than usual...
When Kiryu goes to take a bath, she tries to make him see her as a woman, not just a cousin ...!

[Character Profile]
Miyamae Honoka - A naturally bright and slightly clumsy child and a third-year student who has feelings for Kiryu.

Kiryu Ryoma - A teacher in his second year of work, lives alone and is Miyamae's cousin.

Base +22, Miosan389 +6

For adult onry eh?

Base +6