FIL,s Spunk

Over the four years I've known my father in law, married to his daughter the last two years, I reckon I've swallowed or had pumped into me, over five to ten litres of his cum, possibly more.

Every week day over that time, and recently Sunday mornings too, as I now play golf with him, he's had me suck him off, or he's fucked me.
It's usually in the work van we share every day as Landscaping and building contractors, that I suck him off. But we have had oral and anal sex in many various places.

Chris basically caught me looking at gay porn on my phone as I was resting during my lunch hour, and whipped his cock out. Telling me to suck him off, or I walk home and finish with his daughter, I lowered my head and gave my first ever blow job.
When he came, Chris held my head and forced me to swallow his spunk. And I've been swallowing it ever since.

He does fuck me, but as he says, he's really got to be in the mood, telling me he's not gay, just horny.
What's brought me here, isn't what I've just confessed to, but something that was said to me a month ago.

We'd played golf, he was horny and the woods on the back of the seventeenth were, along with the course at that time, quiet.

Carrying our clubs into the wooded area, Chris had me lower my shorts and boxers. Getting up behind me, he put his wetted fingers all over my hole, then thrust in.
Fucking me hard and fast, he busted his nut up my arse in less than five minutes.
Pulling my boxers and shorts up with his cum deep inside me, we finished the round.

At home later after I'd showered and changed, my wife put some washing in.
She walked from the kitchen into the lounge as casual as you like, looked at me and said "That spunk in your boxers and shorts, I guess it's my dads".
There wasn't a great deal I could say, so I pretended not to hear. She didn't push the comment or seem annoyed, but she did later say "Make sure you're both checked before we have sex again".

Chris and I got STD checked out through an old nursing acquaintance of his. We also had the Covid test too.
Both negative, I let my wife know by leaving the piece of paper on the kitchen table.

Her response was to drag me up to bed and ride my face, then my cock. But as she sat on my dick, she slapped me once hard, and said "Only him".
I let Chris know his daughter knows about us. To my utter surprise he said "She always has".

And that's where I am today. My wife doesn't say anything to her father about him fucking me, and I definitely don't bring up the subject.
What's even more strange, is they seem to have become closer, more chatty.