"Limited incest when drunk" My older sister is a serious, methodical, and beautiful older sister at work, and I'm proud of her. But when you drink alcohol, which you rarely drink, you change as a person...

My sister is extremely cold to me when she's sober. But when she drinks, that cool older sister turns into a nerd. Moreover, she wore her high school uniform and showed it off to me. In the end, she goes into full erotic mode and goes as far as to have sex, and the situation gets out of hand... That's why my sister and I only have incest when she's drunk.