HUNTC-077 Every time I get drunk, my new graduate little sister loses her memory, so we practice sex over and over! Since she doesn't remember even the part where I came inside, it's incredibly lucky!

"Staying for a week" is what my sister said when she came to Tokyo for job hunting. Seeing me enjoying a drink after a bath, she said, "What about mine? I'm old enough to drink alcohol now!" Despite her bravado, she turned into a mess after just a little bit of drinking! She used to make fun of my virginity, but the next moment she mistook me for her boyfriend and started begging for sex! Before I knew it, I had ejaculated a massive load into my sister's vagina, knocking her out cold! The next day, my sister had no memory of what happened, but she seemed awkward. So... it should be fine to have sex every day, right!