Busted, But Still Fucking

Its almost nine months since my mother in law busted me as I was fucking a teenage girl from our neighborhood.
My wife, her daughter, was working away for eight weeks, and I was so horny for pussy and ass.
The neighborhood teenager I know, is a dirty little slut, and it took no time at all to have her sucking on my dick. A fortnight after first fucking her, I was balls deep up her ass in the living room, when my wifes mom Jane, walks in.
I was busted and she knew it. She told the girl to get out and dont bother returning. I thought she was going to begin shouting about how much of a cheating bastard I was.
Instead Jane stripped off in front of me, dropped to her knees and pulled me and my cock into her mouth.
In total shock, it took me some time to respond, but when my mother in law released my dick and said "You better fuck me good boy". Everything changed.
Three hours. That's how long we had sex for. And in those three hours, I fucked her mouth, pussy and asshole many times over.
I also, and this was a first for me, fisted her asshole too. In fact Jane is extremely anal and often had me eating out her pussy, but especially her asshole over those three hours.
She must have had dozens of orgasms by the time we showered together. Then in the shower she had me fucking her ass again.
Sitting in the lounge afterwards, she phoned her daughter like nothing had happened. And indeed I thought I heard her say "Yes dear, she's gone, and I am looking after him".
It was another fortnight before my wife got home and each evening Jane called by for sex.
We experimented trying anything and everything. Jane revelling in having a younger mans hard cock to play with.
Jane also introduced me to one of her dildos she brought with her. Again anal being a first for me. Having her suck on my dick as she fucked my ass with a dildo that first time, will stay with me forever.
Some of the days, it was like our first time together. Long periods of sex, but others when she had things to do, were quick fucks, but still amazingly horny sex.
When my wife returned home, it was like nothing at all was different. We were having sex, great sex, but after a month without seeing her mom, she shows up with my wife out shopping.
We ended up fucking in the kitchen and I couldn't stop wanting her. Even when my wife text me to say she was on her way home, something she never did before, I still wanted to have my cock deep inside Jane's pussy and ass.
We were sat having coffee in the kitchen when my wife walked in. She kissed her mom and I heard her say "Thanks, hope he was good".
Jane replied without hiding her comment "He made my day honey".
They kissed again and I was left with the distinct feeling my wife knew her mom and I had just been fucking.
Now once a week at least, Jane calls by. My wife is always out, conveniently and we always have awesome sex.
There's nothing off limits and since we've been fucking, I've learned so much. And lots of what I've learned with her mother, I now have lots of sexual fun with my wife.
There's still nothing said directly, but I've come to understand my wife knows everything her mom and I get up to. Right down to me tonguing our my own cum from her moms gorgeous ass.