Who's fucking who?

My wife thinks she's clever hiding her little affair. I know she's having one because the guy who's sticking his little willy in her pussy and arse, is also getting fucked by me.
He's like myself, bisexual. But unlike me right now, he finds my wife something of a good fuck.
Up in the hills close to where he lives, as I was fucking him from behind, he told me he'd been banging a married slut. Finishing off our fuck, cumming up his arsehole, he went on to tell me the slag he's shagging has a particular tattoo on her upper back. It depicts a roman scene taken from Pompeii (She's half Italian), which I paid for her to have in Rome. I know it's her, because he also said she has her mum and dads name written in Romanic lettering, intertwined in the tattoo.
I made him suck my cock clean then and thought of punching him, but he's such a good cock sucker, I let him get on with it. Thinking of how to approach my dilemma, I came up with this.
Around two months has passed from the time of our outdoor fuck. In that time, I and my cock have been very busy. Not only have I been fucking him more often, and having him tell me he's falling in love with me (Fool) I've also been attending to another member of my wife's family.
From the moment Grace my mother in law met me, she's flirted heavily. We'd always kept our innuendo's and sexual hints to a level, but once I found out about my wife, I upped the relationship somewhat. Waiting for my wife to go on her annual training week in London, I called by Grace's home (She's fifty one and divorced) Not beating about the bush I ased Grace if she'd ever thought about having sex with someone my age. Before she could answer, I took out my cock and began to stroke it right in front of her. If there was anyone quicker to get on their knees and take my cock into their mouth, I can't remember. Grace was all over my dick, and within ten minutes I was licking her beautifully wet pussy and arse as she continued to suck in every inch of my cock.
I stayed the night and we fucked like teenagers. I'm not ashamed to say she absolutely wore me out. If her daughter is a ironing board when it comes to sex. Dull, flat and boring. Then her mother is whore on heat. By the time the sun was rising, I'd cum deep inside her pussy and arse twice. She was such a minx in bed, I swear she taught me at least four or five new positions.
The whole week my wife was away we fucked each night. Grace would say in the morning how bad it was she was having sex with her daughters husband, then at night she'd be taking all eight inches of my cock down her throat. And wanting ever dirtier sex.
Two weeks ago I began to move funds around accounts and finally withdrew the lot. Money which I'd earned from working extra hours and working some weekends to pay for my wife's growing love of spending/holidays/new cars/nice house. The money is now completely untraceable and safe from my wife's fat hands. Also two weeks ago when she spent the night out supposedly with a female friend. I fucked her mother at our house and filmed it with her knowledge, on my phone. The next day I text her lover and arranged to meet him at our outdoor place. Again I filmed us fucking, or should I say me fucking him. I made sure when I came, I captured him swallowing my cum and had him tell me/my phone, he was going kiss his slut without brushing his teeth.
Next week if one other thing falls into place I'm moving out. I'll also be sending the video's via a well known social site and posting them on my wife's page. So the question is, who is fucking who and in what context ?