Early on in our relationship, before we were married and had had kids, we lived in a very small apartment, just a kitchen and a bed-living room. I got home late one night to find her thesis adviser sitting on a chair, dressed but with his trousers round his ankles and her, naked, with her feet on his knees squatting onto his cock and fucking away while also frigging her clit! He was supporting her with his hands and playing with her tits and pulling at her nipples! As I came in, she didn't miss a beat but carried on grinding away, saying, 'Oh, hullo love, this is George, he's my new thesis adviser, George this is my guy. Oh, didn't I mention that I was living with someone?!'.all without any change of rhythm in her fucking! I just said, 'Hullo George,' undressed and got into bed, watching her fuck this guy, and wanking! My presence however discombobulated him, and he soon left! I grabbed her by the hair and dragged her onto the bed and gave her a right good spanking, followed by a right good fucking! But I spanked her for embarrassing the guy, not for fucking him!