Suddenly Gal Stepsisters

Synopsis

My parents remarried, and suddenly I gained two gal stepsisters…

As an otaku, I expected them to be cute new family members. Instead, I became their errand boy and plaything.

To them, I’m not family—just an object. The only thing they’re interested in is my body.

Day after day, I’m used as a substitute dildo, passed between the sisters to satisfy their desires.

At this rate, I’ll never be anything but a tool to them…

But if I finally have younger sisters, I want them to call me “big brother” in that cute way…

So when the younger sister comes to borrow my body as usual, I decide to take charge instead.

To my surprise, she responds better than expected…?

Can this otaku finally become their real big brother?

A lustful cohabitation with his gal stepsisters begins…!?