I don't know why I let this happen and I know I should feel guilty but I really don't, For a while now I have been looking after my Grandfather who has dementia, As his only living relative I feel responsible for him and I love my Gramps, It started when I was in the kitchen washing up the dishes from dinner, When I heard him behind me and felt his arms slip around my waist as he whispered into my ear "oh Izzy (his pet name for my granny) you look extra lovely today) he pushed his hips against my bum and I could feel him getting hard against me, I was shocked at first but I was frozen to the spot pressed up against the sink, Then as he started to kiss my neck I melted it was such a sift kiss I felt myself getting wet I knew it was wrong to feel that way about him but I couldn't stop it as he kept calling me " Izzy" and started to grope my breasts through my shirt and bra squeezing them firmly I felt myself push my bum against his hard bulge, He groaned and pushed a hand up my skirt rubbing my pussy hard and urgently I opened my legs and his fingers cupped and rubbed me hard I was lost as he masturbated me I shuddered and came gasping loudly, He chuckled and said "you want it don't you Izzy?" I groaned yes and I felt my panties urgently pulled down and the head of his large cock at my pussy I bent over the sink as he slid into me he felt so hard and thick he filled me so much I wanted more and pushed back onto it hard, He started to fuck me hard and fast , I felt so dirty and wrong letting my grandfather fuck me but it also felt so good this man who used to sit me on his knee and buy me sweets as a child was now fucking me, I don't remember how many times I came but it was a lot until he came deep inside me gasping and grunting loudly and calling out NY grand name, Finally he pulled out of me and slapped my bum saying "good girl Izzy" he then left , I pulled myself together and went to the toilet and cleaned myself up, When I found him in the front room he was back to his old dementia self and asked who I was as usual I told him for the hundredth time and made him some tea, It has happened many times since I have even at his request to "Izzy" sucked his large cock but it keeps him happy and at least I am making his last few years alive bearable, No one else knows or will ever know and I find myself looking forward to his moments when he thinks I am gran.