I was invited to my girlfriend's house for the first time after dating her for six months. Her mother, Ryo-san, was the one who greeted me. Seeing her stunning figure in a charming suit, I was overwhelmed with nervousness and excitement, completely ignoring my girlfriend. Ryo-san is an insurance agent, and while mixing in some body touch, she tried to sell me insurance, asking, "Shinji-kun, are you thinking about your future?" I fell for her mature sex appeal, and my crotch became rock hard. Ryo-san noticed this and, to keep it a secret from my girlfriend, she gave me a handjob to make me feel better. Since then, Ryo-san has been calling me out at every opportunity, and we've been having secret trysts behind my girlfriend's back...