We had visitors over the weekend, my stepson, Glen and his son. While little fella slept upstairs Glen slept in the spare room downstairs. On the Sunday morning I went downstairs about 6 am to make a drink and Glen had left his door ajar, out of the corner of my eye I saw a faint light, i looked and saw that Glen had his mobile phone in one hand and his cock in the other! I stood back so he couldn't see me and smiled at the memory of Glen at the age of about 13 coming home from school and going to bed because he was 'tired' :), finding his cum rags in his room and the hilarious time the dog came out of Glens room with a pair of freshly stained boxer shorts in his mouth.
I stood there for a while watching my now 35 year old step son, pleasure himself. I knew I shouldn't watch but I was somehow transfixed, i could just make out what he was watching, a girl playing with herself and he was stroking faster now. I wanted to move but i also wanted to see the end result, I stood there as i heard Glen groan, he bucked his hips as his orgasm hit him and he lay there for a while before wiping himself with a tissue. I realised I had an erection, and had a strange sense of guilt, id been absent mindedly jerking off to my step son wanking, why? Ihavee no intention of ever joining him, he is my son, I've brought him up for 26 years since I married his mum so why was this turning me on? I went back to bed and lay there, my erection quickly subsiding, working though my brain why I was turned on. I think it was because I looked upon it as just a sex act and that's all. It was very naughty catching him but I think next time he stays I'll get him to shut his door
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