On a hot spring trip with a close friend and his wife, one night after returning from the bathroom, the friend's wife, Hiromi, suddenly approaches and kisses me. Whispering softly in my ear, we secretly indulge in sex without getting caught. With people constantly nearby on both sides, we enjoy intense, forbidden pleasure under highly risky circumstances. The erotic scenario unfolds further as I creampie her right beside her sleeping husband, heightening the thrill of this illicit affair.