The Good Grandaughter

my grandmas been dead for like 6 years now so me and my grandfather has now been diagnosed with dementia. I always feel bad for my grandad. And always wanted to take care of him the way my grandma use to. All of his needs. Even the sexual needs. I cook for him. I do his laundry and clean his his house. I write all his checks and make sure all his affairs are in order. I take care of his cock very well. When I see him drinking is always our signal. I hear him stumble to my room at like 12 or so and thats when he makes his move. He pulls out his huge old cock and rubs it in my hand while he lick on my butt. it makes me so wet to feel him using his grandaughter to fufill his needs i feel the precum in my hand and ohh his cock is so hard for a 76 year old man its really hard. I feel him mount me like a dog. and without any hands he diggs his hard wet cock in my butt. (I always pretend to be sleep. Less guilt.) It feels so good and I hear him breathing deeply. Grandad love my butt. Humping me so close I can smell the wild irish rose on his breath as he pumps my butt hole deeper and deeper ohhh it feels sooo good he pumps and pumps until i feel his legs get really strait and feel that cock squirting all that good milk into my butt hole. We always pretend that he has dementia in the morning and carry on with our lives. I love him with all my heart and will take care of him just a he did me for the rest of his life