I was adopted at 8 by a 46yo spinster lady and her two sisters.I was about 12 when I accidentally discovered my adopted mom was leaving her bathroom door open whenever she was drying. This even at this age began arousing me s******* as she had a lovely firm body.This became our little thing because I soon twigged on this was happening when the others were out for several hours running their business.Regularly I would watch from my bedroom and m*********.I was about 15 and through sheer s***** frustration I volunteered to dry her back one day so she agreed.I was soo erect and dripping wet under my shorts as I was rubbing against her firm bare hips.Within minutes she turned around and we started at each other.I saw everything she had and I noticed she was wet between her thighs.I was still nervous though but she reached out and slipped my shorts down a little and started to m********* me a little.She then asked me to go to bed with her and I could learn about s**.Immediately she asked me to mount her,this was awesome as she guided me inside her and I started to f*** her while we gripped each others hips.Soon I was ejaculating like never before and when we finished we held one another.I was soon erect again because she turned around and I started rubbing my erection against her hips.Within minutes I was mounting her from behind and really riding her hard like bouncing off her bottom hard.We continued having s** until she was 59,it was fully consensual and we were not related.