I found a flyer looking for someone to share a room with and visited a house, where I ended up sharing a room with Yamaha Hotaru, who was a middle-aged divorcee living alone. Hotaru is kind to me and always looks out for me. I'm glad about that. But because of that, I don't have much time to myself and I can't masturbate... Even though I get turned on every day just because of her underwear in the laundry or her plump thighs peeking out from under her short skirt. Then, one day, I witnessed Hotaru masturbating in the bathroom, and I just couldn't hold myself back any longer...