All In One Bed, Who Knows.

Years before my sister even met her husband I was fucking him most weekdays as we were colleagues.
We worked from a van, so I'd fuck him in the back of it, or outdoors if it was private enough.
He got a new job with much better pay after around seven months, so we only fucked if and when we saw each other outside of work hours.
Three years ago my sister met a new guy, and because I'd moved I didn't get to meet him until they'd actually gotten engaged.
He'd told my sister he used to enjoy gay sex in his past and had a brief affair at work with a colleague.
However he'd told her my name was Olly, but that was my nickname in work (Long story).
When we did finally meet, we both kept cool about our past and pretended it was our first time meeting each other.
But every time I saw him after that I just wanted to bury my cock up his beautiful arse.
Four weeks before they tied the knot, he finally told my sister I was the one who he'd been having gay sex with at work years before.
It didn't phase my sister one bit. In fact she seemed kind of relieved it was me.
Then the week before they got married and on my future brother in laws stag night, my sister asked me if I'd look after him. When I said "Of course", she added "No, I mean I'd like you to fuck him. I think he wants it".
Somehow we both stayed relatively sober ish during his stag night and having already booked us a hotel room, I seduced him.
It was some of the best sex we'd ever had together, and I even let him fuck me, something only two other men have done.
We had sex the following morning as well, as I fucked him in the shower before we got dressed to check out. And driving him to my sisters place that afternoon, I had him suck me off down a country lane on our way back from playing golf with a load of mates.
Once they'd gotten back from their honeymoon my sister phoned me. It was a brief phone call and one that surprised me.
She wanted to know if and when she worked away (It's part of her job to fly to different European countries to assess hotels) would I 'entertain' my brother in law.
It was a simple "Yes" from me.
And now eighteen months on from their wedding, at least twice a month he stays over at my place and I fuck the spunk out of him.
My sister and I wouldn't talk about my nights with her husband at first, not until recently when she returned home early from a trip.
Instead of letting her husband know, she surprised us both by walking into my home.
Luckily we'd not long stopped fucking. Even so we were both naked and I definitely saw the lust in my sisters eyes as she looked at my cock.
Dressed and drinking coffee, we sat talking. It was clear to me anyway, my sister had wanted to catch us actually having sex, but she didn't say anything directly. But she did comment when they left.
Patting my arse she smiled at me and said "Thanks for looking after him, maybe next time you can wait until I get here".
I knew exactly what she was getting at, yet I didn't say anything.
She's away again next week and text me this yesterday "I'm away two days next week. I'd like to think we could have some fun when I get back. If you're not up for it, I'll understand".
It's been a while since I last fucked a woman. Not because I don't like pussy, I do. It's because I'm well endowed and men can definitely take a longer harder fuck from my dick. That said, I'm seriously contemplating fucking my brother in law as well as my sister. Who I now know definitely wants my cock.