Caught Out

The day before we went on holiday last month, my father in law Mike caught me having sex with an older man.
I was taking the guys cock up my arsehole from behind, as I leaned over our coffee table when Mike walked in.
What blew my mind, was how calm he was in asking the guy to leave, but telling me to where I was.

All sorts if thoughts went through my head over those five frantic minutes for me. The one thought that didn't pass through my mind, was Mike having me kneel exactly where I'd been when he walked in, and him sliding his cock up my arse.
Telling me when my friend had gone, if I was going to have extra marital gay sex behind his daughters back, then it wasn't going to be with anyone, but him.
There was absolutely no sensuality in how Mike fucked me, non at all.
It was brutal, hard and very forceful. So much so, he drove me to a very quick orgasm before dumping his cum deep inside of my arsehole.
When he stood up, he told me to clean him.
Turning around he had me lick and suck his fat cock clean, then slapped me hard so I flew over onto the sofa.
I was told by him, no one other than him from then on would use my mouth and arsehole.
And as simply as that, my father in law walked out.

I still feared he'd say something to his daughter, but we went on our week long holiday to Greece and returned without him messaging her about what had happened. Or that's what I'd thought.

We've been back five weeks and in that time Mike has fucked me at least three times a week.
And up until last week, not long after he'd been round (I work from home. He retired early) fucking me in our shower, my wife messaged and asked if her dad had been round yet.
I replied he had, to which she messaged back this (I still have the message)
"Oh ok. Wanted him to look at my car after I finish work. Hope you guys had fun. Dad says you're close now. Love you x".
There are smiley faces after she mentions her father and I being close, plus a wink.

She hasn't said anything directly to me since, but has mentioned very casually that she likes the fact her father and I are 'Close' now, stressing the word close.
Now I'm thinking she knows perfectly well I'm taking her dad's cock down my throat and up my arsehole.

It's still not what you'd call passionate sensual gay sex, as we don't kiss and there's no caressing or anything, but Mike has begun to fuck me missionary and stroke my cock at the same time.
He's also began to tongue my hole before fucking me also.

I'm tempted to ask his daughter and or him if they've spoken about us having sex, but I don't want to spoil anything.
My wife and I are still having sex, and I enjoy what we have together. But I also love her father fucking me too. I just wish I knew if she's ok with her dad fucking her husband.

After all I'm not going to leave her am I.