HUNTC-077 - Repeated sexual training with a very convenient new employee sister who loses her memory from drinking! I'm very lucky because I don't remember being ejaculated!

My sister, who came to Tokyo for job hunting, said, "Let me stay for a week." She looked at me enjoying a drink after a bath and said arrogantly, "Give me some too! I'm old enough to drink now!" but she became completely drunk with just a little bit. She made fun of my virginity, and the next moment, she mistook me for her boyfriend and asked for sex! I ended up knocking out my sister Ma○ko with a massive ejaculation! The next day, unlike me who was awkward, my sister had no memory of it. So... is it okay to have sex every day?