I Get These Urges Sometimes

I still get nice and hard, pleasure myself almost daily, my wife though is not really into sex anymore. She spends hours and some times the weekend over with the grandkids, who by the way are almost teenagers.
I have made some ropes and fantasize about tying her down to this ottoman we have, legs tied off at the knees held spread out wide and wrists off to a hip rope or the legs of the ottoman. I would lick her pussy until she orgasmed several times then fuck her until I came as many time as I could, maybe even get a few hardon aids to keep me nice and hard for a while.
See, here is the thing, she is still fucking hot, has like 38F cups and a wears a size eight and no pudgy tummy. Her pussy is amazing to look at, just lips and fold everywhere and she used to love it licked and her clit sucked on until she had several orgasms. Her nipples are still red, breasts are a bit more saggy than when she was in her thirties but still fucking amazing for sixty years old. I get told by friends all the time what a lucky fucker I am and I just say Yeah, sure but come on your wife is fun too right?
Nope they say, have not had sex in years and I say Yeah, me too and they think I am lying to them.
I just want to have sex with her like two or three times a year, guess that is too much to ask for and pretty sure tying her up would end badly. Well, back to jacking off.