Sister’s Pleasure Fall – Forced by Big Brother

Synopsis

An older brother who dotes on his younger sister Yuka overhears her phone conversation one day. She’s talking cheerfully with a boy from her class about their future, discussing going to the same school. From the conversation, he discovers his sister has a boyfriend. Desperate and convinced the boy is causing her recent coldness toward him, the brother becomes obsessed with keeping them apart. He confines his sister, planning to monopolize her during summer break when they’re alone together. With nothing to lose, he begins a training regimen to rebuild their sibling bond and make her entirely his.