While I was on a date at home with my first girlfriend, my childhood friend suddenly came over. I spilled wine on my chest and my childhood friend wiped it with a towel, but the friction of my nipples made me ejaculate inside my pants! I thought she would make fun of me, but she couldn't bear to watch and trained my sensitive nipples by teasing my nipples. She then became my sex practice partner and supported me in strengthening my premature ejaculation with nipple play sex. My childhood friend was a big sister type since I was a child. I never thought she would be so caring... I borrowed her chest, or rather her pussy, and cummed inside her many times, training my nipples and growing into a full-fledged man.