COGM-083 A college student and a working adult share a room - A sweet life with a naughty younger sister

Share houses are common overseas and are on the rise in Japan. A few months ago, my university junior Koharu came to live in a share house where my best friend and I split the rent. She's easygoing and always smiling, and we decided to live together because it seemed like fun. Living with two guys, doesn't that mean her chastity is messed up? As expected, she had a relationship with each of them, and now they're good friends!? A life of non-stop sex. On this day, while Koharu was cooking dinner, I teased her and we got cozy. After eating, I couldn't hold it in and we ended up having sex. We took a bath together, and couldn't hold it in there either, so I gave her a periscope blowjob. But we're not dating or anything. What does Koharu think? I like you a lot, though... My best friend came home from work, and the three of us went for a drink. Then, of course we did it. We did it in a threesome and ejaculated a lot! I don't care about whether I like her or what kind of relationship we have. That's OK because sex sharing life is fun!