Why did my admired teacher, Ms. Obana, come to my house?! Suddenly, Ms. Obana, whom I had a crush on, became my step-sister and we started living together! At school, she was a pretty and smart teacher, but at home, she was a dried fish woman who drank beer after a bath! She was unconsciously tempting me as she walked around in her thin loungewear, showing me her ass and breasts! I got a full erection seeing her in a different outfit from school! She whispered in my ear and watched me as I masturbated, had sex secretly in the living room, gave me a titjob to encourage me, and had creampie sex with my big sister! I never wanted this life to end...