This is a little weird. My grandmother has advanced Alzheimer's and about three weeks ago my parents moved her into the guest room to care for her. It's a little weird watching her walk around mumbling and doing strange things but she doesn't really bother me.
About a week ago my boyfriend came over and we were up in my room making out after smoking a blunt and before long I was giving him head. I heard the door knob turn and my grandma walked in on us something she had done before. I got freaked out the first two times but once I realized she had no clue what we doing I would just walk her down the hall and go back to having fun. I did that this time, shutting the door and locking it. I returned to my boyfriend and gave him head until he said he wanted to fuck so I got up on my knees over him and sat down on hid thick 7 inch cock. I was riding him and getting into it when i felt fingers around my hard dick. I moaned at the feel of getting my dick stroked when I realized his hands were on my hips. I looked down to see my grandma, smiling, stroking my dick!!! I started to get up, pushing her hand away but my boyfriend stopped me. It was freaky but i rode him while my grandma jerked me off and when he came I shot a huge load on his chest and fell exhausted on him... it was really weird