It’s Big Sister’s Fault

Synopsis

A sister who is both close and distant.

The opposite sex he’s known best since childhood, yet now they’ve grown apart… His big sister has come back home.

Kouma, the younger brother whose life and sexual preferences were ruined because of her, is reminded of the trauma from his big sister’s “pranks”… and his member becomes swollen—

“Big sister totally footjobbed my life!?”