Lately, I can't stop having sex alone. I especially enjoy doing it in places with few people, like changing rooms or toilets at stores. I go into the restroom, take off my suit and underwear until I'm completely naked, and to muffle my sounds, I stuff my underwear into my mouth and start masturbating. Many people pass by outside, and sometimes others enter the restroom, making me anxious about getting caught—but that fear only heightens my excitement. My lower body tingles intensely, my legs tremble uncontrollably from the numbness, and I end up climaxing three times. Recently, after work or while shopping at department stores, I rub my clit and slit through my underwear in secluded spots until I stain them, then head into a fitting room. There, I stuff my removed underwear into my mouth, stand up, thrust my hips forward, and masturbate vigorously. I climax within about five minutes, so I always do it at least twice. It feels so good that I can't quit. I often leave behind my wet underwear—maybe if someone picks it up and sniffs it, I'll feel even more aroused.