There is a couple across town that I see regularly. I spank his 55 y/o wife while he watches. Usually he's in the same room with us. Sometimes he stands in the hallway, once he went outside and watched through a window.
I spank her with either my belt or a leather strap. I always scold her in front of him to get things going. I get her to admit that she needs to be spanked. Then I make her strip in front of us and if I decide to use the strap, I make her go get it for me. She's usually crying by then. Her crying continues until I tire of strapping her bare ass. Sometimes I do her OTK, sometimes she lays on their bed with a pillow or two under her tummy. When she's in this position I use the strap from her upper thighs to the top of her ass.
One time I had her OTK and slipped a finger across her tw*t. It was soaking wet. A few flicks on her clit and she was cumming. That night she gave me a blow job when I finished. Yes... hubby watched that too. Now she blows me every time.