Catching family

So recently we had to move house. My partners dad lives with us, not by choice but hopefully not for much longer. My partner and I havnt really been having much sex for sometime now but we finally got around to doing it. I had her hands tied up, mouth taped vibrator going, fucking on the side.
It was great, her moans when she reaches orgasm are wonderful, just like a song bird. I’ve never been with anyone else which could compare even with her mouth taped muffling the sounds!
It was the first time in ages and finally releasing some built up stress as I came inside her.

Anyway later on while setting into the new place, we had news that my partners sister (my sister in law) was going through a divorce after he was caught cheating multiple times. So of course we now had to make room for my sister in law to move in. Now it’s not a particularly private room, we walk through it to get out the back.

One night I’m home watching movies and my sister in law had a male friend over. I put my headphone down and thought I heard some moaning coming through the door. I didn’t think much of it and got up to get some snacks. I sat back down and heard more moaning followed by the door closing not long after. This started getting me turned on just by the thought of it and before I knew it they went outside and I went back to the movie.

Later on my sister in law and friend left, I had to walk out the back to get a few things and right there on the bed were some red lace panties that were visibly soaking wet. I instantly got turned on by the and noticed she had a draw left half open with cuffs a few dildos and vibrators visible in it. I knew then that this is more then just a friend and it turned me on having someone fucking my partners sister right there.

A few days later and my partner was keen to have sex again! Our son had just gone to bed though there was other people walking up and down the hallway. Of course I didn’t turn her down, though just had a simple quickie few different positions though this time I pulled out and came on her hairy vagina. I haven’t pulled out in ages as I always loved to thrust deep inside as I came but seeing the cum drip down through the hair was great!

Now I’m hoping this will be a common thing again, I miss the times when we would try all different things but that all changed after a medical emergency some time ago. Got me thinking about all the fun we’ve had and new things we might try.

Just after my partner and I had sex, we hopped in the shower and as we got out her sister had come back. Later followed by her male friend while I was watching another movie.
I got up to get a drink and as I looked back there they were! My sister in law and her male friend fingering her. I could only see a small portion of the the cracks but she was definitely getting fingered, one leg up in the air.

I walk up closer and then there was a sudden gasp from what I could assume was him putting his dick inside her, Followed by slow moans. I couldn’t see them at this point but I could hear everything as it echoed through. The moans got louder and faster and she sounded like she was struggling to hold back the noise. The bed started creaking and within a few minutes a couple of hard thrusting sounds with a wet sloppy slap and it all came to an end.

Been a fantasy of mine to catch someone like this but never imagined it would have been so close to family!
What’s everyone’s thoughts? Should I tell my partner what happened just a couple rooms over? She had already been assuming this male friend was more than just a friend.