[Sevengar] Toshiue Onee-san Oraora-kei DQN ni Kaeriuchi ni Sare Mesu Ochi

A fierce tomboy who's shielded her childhood friend from bullies since they were kids swears she'll finally destroy the delinquent tormenting him in high school—but when he's called into the room afterward, he finds her pinned beneath that same blond beast, her legendary strength dissolving into ahegao as she's pounded senseless right in front of him. Helpless to do anything but watch, he witnesses the woman he secretly loves get stolen and remade, her body claimed with every merciless thrust. The epilogue arrives as cruel texts: photos of her blindfolded, collared, and covered in body writing declaring her his property, no longer the protector he knew but a broken plaything who exists to serve.