My earlier story is brief, so I included it as part of this story.
My wife and I seldom have traditional intercourse but regularly masturbate each other for our mutual satisfaction. (See the linked story - Mutual Satisfaction). My wife and I are both quite heavy. Our size, plus my rather small penis and my wife's loose vagina, makes it difficult for us to have satisfactory sexual intercourse. I don't get enough stimulation, nor does she.
Our favorite position for mutual satisfaction is for her to lie on her back, knees spread and pulled up to her belly. I get on my knees as close to her as I can. She holds her knees up and spread. I insert three fingers of my right hand into her vagina and stimulate her g-spot, while the thumb of the same hand massages her clitoris. This position allows me to see her breasts, face, and genitals. She usually orgasms several times in just a few minutes. When I can't hold back any longer, I use my left hand, lubed with her juices, to rub my penis until I orgasm and ejaculate on her belly and breasts.
Often her legs get tired before she is completely satisfied, so I devised a sling attached to a pulley attached to the wall above the head of our bed. She puts her legs in the sling and I pull the rope attached to the sling and her legs are held up and spread, giving both of us unlimited use of our hands to stimulate each other and ourselves for as long as we want to.
The sling has added a new dimension to our sexual satisfaction. Her hands are now free to stimulate her nipples while I pump her clit and massage her g-spot. Alternatively, she will masturbate herself as I watch. Her legs spread and supported by the sling allow her full access to her pleasure centers and afford me an unobstructed erotic view of her self-pleasuring. As I watch, I masturbate, kneeling and facing her pussy. I try to have at least one orgasm at the same time as she climaxes.
Since we began using the sling, my wife wants sex almost every night. Wonderful!