My best friend and his girlfriend and I went to a hot spring. She changed into a yukata, and I could see her beautiful nipples without a bra on, which made my Kokoro flutter. Was she trying to seduce me? Was it a coincidence? My cock was throbbing and I couldn't control myself, so I attacked her. She resisted, saying "No...", but her breath leaked out as I touched her sensitive nipples. I felt the excitement of our forbidden affair, ignoring her boyfriend.