MIL Said Just Once, Lied

My wife's mother has huge cupped breasts. My wife inherited her mother's big tits. I fantasize of seeing my mother-in-law's big cup tits and compare it with her daughter's. When my wife's mother is about I can't help not looking at those jugs. My mother-in-law accidentally saw my exposed privates when she stopped by for a visit one day. Then some day later when her daughter wasn't around she told me I had a nice cock and it intrigued her. I confessed to her that her breasts intrigued me and wanted to know if her cup size is bigger than her daughter's jugs and how they looked at her matured age.
" I dream of getting laid by a young cock and your's looks nice to me. " she said as she removed her top. " This would be a one time secret thing between us. " as she placed my hands onto her wide jugs. She guided me in the bedroom and removed my pants revealing my erection. To my surprise she went down and started taking my cock in her mouth. Her daughter would never give me a head job. A tit job, yes. My wife's mother removed her clothes exposing her mature aged body spreading her legs. " Poke me ! " I eased my dick in her and started to pump her slowly. " Hump me harder ! " and I did staring at her tits as they moved about. She kept yelling " Harder ! " I kept humping for quite a long time. Longer than I ever did with her daughter. I filled her snatch with my sperm. " My daughter married a fantastic guy ! "
I thought that was it. I saw her tits , screwed the old bag and received a head job. I was wrong. She would give me blow jobs enticing me to poke her when possible.