Fuck, my younger sister likes to lock herself in the room

Mio is my younger sister, always messy, clothes not tidy, always glued to her phone to the point of nearsightedness. Now she completely isolates herself, locking herself in the room and refusing to go out. A typical hikikomori. At first, I wasn't interested in Mio at all, but one day I accidentally witnessed her masturbating, and I discovered how beautiful Mio really is! Although I knew it was wrong, my sexual desire overwhelmed my reason. I rushed into Mio's room, claiming my beautiful younger sister.

I thought Mio would resist fiercely, but no! Mio quickly synced with me, enjoying the pleasure of sex with me. After that incident, Mio no longer withdrew, she started going out to eat with the family. My parents were very happy to see Mio returning to normal. But little did they know, the two of us continued this extremely wrong relationship...