ECBM-010 The brother was so captivated by his adorable younger sister that he kept trying to get close to her and secretly film her, but when his drunk sister came home, she mistook him for her boyfriend? A forbidden, sweet, lovey-dovey intimate encounter with Yui Tenma

Reiya and Yui became step-siblings through their parents’ remarriage. They had a good relationship and got along well without any major conflicts, but Reiya’s feelings were a little twisted, as he would secretly sneak into Yui’s room at night and spy on her. One day, Yui went out on a date with her boyfriend and came home heavily drunk. Reiya kindly took care of her, but Yui mistakenly thought he was her boyfriend and became overly affectionate. Before long, the two crossed a line and ended up becoming intimate.