My wife's grandmother

It all started as a joke. I would fuck with my wife telling her that whenever we visited her grandparents I was gonna bend her grandmother over her bed and fuck the hell out of her. It was a running joke for a couple of years until one day her grandmother over heard me fucking with my wife about it. Anyway we were visiting her grandparents one weekend and my wife had to to go to work early and I was lounging around the house when Ricki that's her grandmother came in our room. She sat down on the bed and said she overheard me telling my wife that I was going to bend her over the bed and fuck the hell out of her. It kinda took me by surprise and I said I was only playing with my wife. Ricki I said I've always played like that. Ricki says well maybe I'm up for that. Maybe I want you to fuck the hell outta me. Instantly my dick got hard. Ricki seen what happened and blushed deep red. She said it has been years since she's had sex and then it was with her husband and he had a small dick. Well I pulled my shorts off and showed her that my dick wasn't small. She gasped at the enormity of it. I have a 12in dick and very thick. I reached up and wrapped my arms around her and pulled her to me and kissed her gently. As I was kissing her I reached and fondled her tits. She let out a little moan. I took her clothes off and laid her down and sucked her tits and moved down between her legs and started eating her pussy. She came almost immediately. Later on she admitted that that was the 1st time she ever had her pussy ate. After eating her pussy a little while longer I raised up between her legs so we could fuck. To be 75 years old her pussy was still soaking wet. I put the tip of my dick at the entrance to her pussy and eased it in. She gasped loudly and said shove it in all the way. That's what I did. And let me tell you something her pussy was tight as a virgin pussy. She said fuck me hard as you can. So I did. I fucked her harder than I have ever fucked a woman before. We fucked for a couple of hours before I busted a nut. When I finally got ready to cum she wrapped her legs tightly around my waist and raised her hips to meet my last few strokes and when I started cumming she had the most intense orgasm I have ever seen she clamped down on my dick like a vice and squirted a river and screaming at the same time after we finished she said that was the best fuck she has ever had. Now whenever we visit her grandparents I better make sure I'm real rested because grandmother is going to fuck me as much as possible until we leave.