Mentally retarded grandmother
My grandma (mom of my dad) lives with us. She's quite old and she's mentally retarded (say my parents). Grandma does not speak since over 6 months now. When my parents are out of the house, I have to watch and care for Grandma. I love to show her my cock. Once I came from the shower and she stood in the floor. She looked all the time at my cock and when he got bigger and bigger she smiled at me. Since then I show it to her and I masturbate in front of her. I think she's not only ok with it, she likes it.