MIDA-389 Cute Shut-In Girl Who Hates Going Out - I Accidentally Saw Her Masturbating, My Sanity Collapsed... My Little Sister Came, But I Didn't Notice and Kept Raging as I Thrust In - Nana Yagi

The story follows a cute homebody girl who is masturbating at home when she is unexpectedly caught by her brother. His rationality collapses in an instant, and he uncontrollably goes berserk, thrusting all the way in. Even after his sister reaches climax, he remains oblivious and continues the intense thrusting until complete release. This work focuses on the taboo brother-sister relationship and the sudden eruption of passion, revealing the homebody girl's hidden side and the breakdown of family ethics.