Husband And Grandma Have A Thing For Each Other Sexually I Found Out

I try to be a good wife and keep an open mind. My husband spends a lot of time at my at my grandmothers place. She's a frisky old gal that other women can 't compete with at her age. She's so energetic and wears open top clothes with lots of make up on. She and my husband have a strong close relationship. I didn't realized they was sexually involved until I saw her giving my husband a tit job in her back yard. They didn't see me standing around the corner of the house watching them. For some reason I was curious and couldn't understand what they saw in each other, but seeing her enjoying my husband's dick in her wrinkled stretched out tits while jerking it kind of turned me on.
That night in bed I got him to confess to me his doings with my grandmother after we had wicked sex. " I know you won't understand but the wrinkles on your grandmother and the loose skin of her body turn me on and I get very horny. " She caught me masturbating and helped me get off. She liked the idea of using me as her boy toy with our age difference. " I'll find out the truth after I confront her her tomorrow! "
I confronted grandma and found out as old as she was, she felt youthful inside her. I told her I have an open mind and willing to share my husband if she doesn't object me looking. I told my husband he could use granny for sexual desire because I'm open minded and understand. I confessed to him while watching him and grandma I got moist below and nearly climaxed.
I told grandma what I was going to do. I was going to expose her aged body to my husband while watching her take out his dick and blow him. Then see her ride reverse cowgirl on his dick as I watch her wrinkled tits swing about while I'm playing with my clit and calling her a tramp until we both reach a climax.