Pre teen i would watch my 49 yr old foster mom wash at sink.She was small with a nice full body and wore a corset.She would leave the door open when we were alone so i would stand and m********* in hall.Once i turned 14 things got too much so i walked in one day and asked if i could wash with her.Of course son she said why dont you slip off your shorts.Obviously i was erect and she complimented me on this.Something automatically happpened then as i remember and i started to massage her shoulders while rubbing my p**** against her lovely firm white hips.As i was rubbing against her i just exploded all over her saying how sorry i was.She told me it was OK so we cleaned up. This then became a regular thing whenever she washed and eventually got to the point where she actually guided me inside her.I was about the same height so i slipped my p**** between her buttocks and she let me ride away.Her bottom was amazing as her white hips vibrated as i went to town on her.I was proud when she began to o*****.Obviously this led to us stripping off and her taking me to bed and me learning all about s**.