Continued From below: He was feeling so much pleasure with each stroke he didn’t know what was going to happen on the next stroke, he just knew it would be even better, then he exploded inside her panties. She was amazed because she knew he had ejaculated from health class that was her first experience with a boy ejaculating. He struggled to remove himself from her panties while stammering about being sorry. She calmed him down by telling him to lift the elastic and get up carefully, that she need to rinse her pantie out and get a shower before mom gets home from the grocery store.
He has loved satin panties since he was twelve, when his big sister was wearing them laying on her bed. Mom was at the grocery store and he lay down with her in his tight white underwear. Her soft warmth was nice and soon he was rubbing against her and she never said anything, she just let him have fun as if she knew how special it was for him. Eventually his underwear was pushed down below his nuts and he had his penis between her soft butt and her satin panties. They had gently worked into a position where she was on her tummy and he was on top of her humping. She was only three years older, and had been fantasizing about sex a lot, but had never experienced it.