On a bus route, I found myself seated next to a woman who seemed to be a married lady returning from shopping. She was wearing thin clothing, her large breasts and mini-skirted buttocks pressed closely against my body, transmitting sensations that excited me and caused an erection. With her mini-skirt flipping up by my erect penis, revealing her underwear completely, her sense of shame transformed into excitement, panting heavily, and she did not resist if the situation escalated into a lewd act. I secretly tried inserting my erect penis from the side of her underwear.