Found out in October of last year, my wife had cheated on me twice with an ex boyfriend of hers. Pissed off and hurt, I tried to speak to her father about her past relationship, hoping to find out where the guy lived. His response was to say "You've found out haven't you". He'd known all about it, but had said nothing. Whether he was feeling guilty, or he'd figured me out (I'd once fucked an older guy when I was fifteen), he then asked me if I'd like to take out my anger, my frustration on his arsehole. Most of that afternoon and into the early evening I had my father in law either sucking on my cock, or I was fucking him. In total I fucked him three times, cumming each time up his ex army tight fifty one year old arse.

Back at home I waited until my wife got home from her gym class, told her I was horny for a blow job and made her suck on my cock in the kitchen. Not once thinking I'd become erect and cum, I did know I'd not cleaned my cock off since fucking her father's arsehole bareback. She sucked and licked away on my dick for ages, then without thinking I could with my dick throbbing, I came in her mouth. It wasn't much, but it was enough for her to pull back and tell me she'd loved sucking on my dick, this after she'd swallowed what little I'd produced.
Not one week has gone by since then, that I haven't fucked her dads arsehole. And every single time I've saved his anal juices on my cock for her to enjoy as she blows me off. Just the other day, only half an hour after fucking her dad in his home, I fucked my wife's arsehole in exactly the same position over the arm of our sofa.
Now I couldn't give a flying fuck about her fucking her ex. In fact if I knew he would let me, I'd fuck him too.