Cheating

I thought we had a regular family, mom dad and me. Male 6 feet tall medium build.
2018 mom's mom passed away and left her house to mom. It was fully paid for so it made sense to move cities and live in her house.
Mom was the clever one and got a job in sales and dad worked part time from home, I was at school. Mom got promoted after 6 months but it meant days away from home.
The house was located outside of town in the country all on its own. All was good until mid 2019 when mom came home early, a Sunday, was not due home till Monday.
Mom said she did not feel too good and asked for dad I said he went out this morning.
Mom decided to drop papers at the office in case she felt worse tomorrow, she had keys.
At the office not a workday she heard voices and moaning from her bosses office, keeping quiet she crept to the door, peered in the window at her boss on her knees on the couch naked saying yes George yes fuck my arse, fill me with your cum.
Georges cock was fully buried in her bosses arse, and George just happened to be my dad.
Mom was going to barge in screaming but thought about it, I said she was clever.
The company was owned by her bosses husband who was 15 years older than her.
Mom walked in saying it's ok don't get up, let him finish first.
She then set the terms, work from the office with a large raise, also a non contested divorce with no money paid by mom. Also to pick up all his stuff by end of day tomorrow off the driveway or she will burn it, and finally he must never call by phone or in person to myself. Letters only if he breaks any rules the bosses husband along with the town will know everything.
A few months past, I noticed mom was drinking more, wine, but more often.
One night after we went to bed I got up for a pee and passing mom's room heard what I thought was crying it was muffled but I was concerned, I tapped on the door and entered the only light was a nightlight, I went to the bed and asked if she was ok.
She just said cuddle me will you son. I got on the bed, I only wear boxer shorts to sleep in have done for years, it was cold, late autumn, mom pulled up the sheets and said come in,
I spooned mom and we did not speak, she had pulled my arm over her and held my hand just under here breast, she has nice ones 34C, after a little while I made to move out, but she asked me please stay longer, how she feels sad. No problem, but I fell asleep and awoke maybe an hour later to feel my mom's left breast in the palm of my hand, she had pushed my hand into her nightie then put hers on the outside holding it in place.
Mom was sleeping gentley, I did not want to wake her, so fell back to sleep.
I awoke to a lovely feeling of my cock being stroked, it was rock hard, like most mornings, I looked to the side, mom was smiling, before I could speak, she put her finger across my lips and said shush! Mom then pulled back the cover exposing my rampant cock, mom then leaned over, put the head of my cock into her mouth, it felt so hot, she quickly straddled me took my cock with her hand and guided my cock to her wet pussy hole and sunk down to take all 6 and a half inches. She made beautiful moaning sounds, again putting her fingers over my mouth so I could not talk. She orgasmed and when I moved her hand and said I was cumming, she told me to cum in her it was fine she cannot get pregnant. I grabbed her waist flipped her over on her back and fucked her hard and fast until I exploded inside my mom's pussy.
After we talked, she told me my dad was crazy doing what he did, how he wanted to fuck mom's arse, but she said no, her pussy and her mouth is ok, she will even swallow cum if she gets warning. She said otherwise dad was a great lover, how they fucked three times a week at least, and she would blow him when her periods came.
How last night she was not crying, she was playing with her pussy and close to cumming.
She knows I don't have a regular girl, I have had a couple of fucks before.
Mom wants me to be her lover, how no one comes to the house, only we would know and she prefers my cock to a stranger's, as she needs to get fucked often, also she will teach me to do cunnilingus like Dad did.
I know it's wrong but fuck, my mom is a fantastic lover, she says it's up to me which year we stop fucking.
Throughout COVID we have continued our loving, even dressing up, as teacher, schoolgirl,stripper and pretend bondage. I love my mom.