Mitsu was living happy days with her kind boyfriend, but then her parents' remarriage brought an older half-brother into her life... and he turned out to be the notorious playboy senior at her boyfriend's part-time job. On a day when her parents were away, she was attacked and impregnated, shattering her happy routine. Under the same roof, her vagina was gradually remodeled for her brother-in-law's use. She increasingly stopped answering her boyfriend's calls, eagerly offering blowjobs. She transformed into an orgasm-loving sex girl, unable to live without her brother-in-law...
