Strip poker with step-grandma reaps unexpected reward

My step-grandma Lynn is 63 over for a visit. She told me and said she felt like going to a casino and would love to learn Texas Hold-em. We sat down to play. It got boring fast. She suggested we play for something that would make the game exciting and to play strip poker. Suddenly I was all attention to the game, and I played seriously. It wasn't long until I had her down to just her long white slip. I only needed to win one more hand to see some flesh, she lost her hand and dropped the top of her slip and I saw her amazing tits. My cock was raging hard, and I made an excuse to go to my room where I intended to give it the attention it needed. She came into my room and said we can't leave off where we did. She decided to give me a little show. She masturbated herself to an orgasm while giving me a good look at her old pussy. After she came, she began to work and suck my cock until I couldn't hold back any longer and I shot a big load of cum into her mouth.