My smooth and obnoxious father-in-law, whom I never liked much, came to stay and in the morning when I made his bed I found the sheets were stained with sperm. I knew at once it was deliberate, that he wanted me to know that he had masturbated in my house and for me. I wasn't shocked – I know my husband masturbates secretly - but I did think he had a bloody nerve. On a hunch, I went to the bathroom and looked in the dirty washing basket. Sure enough, a pair of my soiled panties and a bra had gone and I couldn't find them again despite looking through his travel bag. The dirty bastard was due back again in the evening and he came with Jim my husband so I couldn't show my fury. Really, what is it with guys that they have to behave like such pigs. There was nothing in his demeanour to show there was anything amiss although he must have known I had discovered what he'd done. I mean he hadn't even tried to hide it. He even talked to me quite naturally, ignoring the fact that I was quite cool towards him. I couldn't make it too obvious in case Jim noticed. When I went up to bed, I left the two of them drinking and on my way I slipped into his room and put a box of tissues right on his pillow. And of course the next morning there was a pile of cum soaked tissues on the floor for me to clear up which I did after putting on rubber gloves.

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I had to go to my son's town for a couple of days on business and invited myself to stay with him and Sonia his wife. She's a sexy little piece is Sonia and I know she doesn't like me but that doesn't stop me beating my meat for her now and again. I've got a couple of photos of her in her bikini – she has such cute little tits - that she doesn't know I have and I like to look at them while I'm wanking in the nude. I don't know if its legally incest to lust after a daughter-in-law but I get a thrill thinking it is. I like to imagine it's her hand that's wanking me off. Anyway, I get there for the visit and when Jim my son isn't looking, Sonia can barely disguise how unwelcome I am. So bedtime comes and I don't have any of this planned but in the bathroom I peek idly in the bin where they put their dirty clothes and I find the thong knickers Sonia has just discarded. They weren't actually very soiled but there's a rich aroma of pussy and ass that I found irresistible. (How is it that the smell of a woman's shit is so delectable when you're sexually aroused?) I took them to my room to play with myself while sniffing her dark, intimate smells that even Jim probably doesn't know about. One thing led to another and before I knew it, I'd cummed in the sheets which was quite unintentional. I knew there was no way I could hide it so I thought, shit, I'll brazen it out. I had a few more wanks with her knickers during the night and left the evidence except the knickers which I hid for later. When I got back to the house that evening, it was in the knowledge that she knew I was a wanker. I loved it and the fact that she was furious but couldn't let Jim see made me love it even more. Then I discovered she'd left a box of tissues on my bed that night so what else could I do but take that as a further invitation to indulge my vice. Nothing was ever said but I've noticed that at family reunions, dear Sonia takes great care never to be alone with me. So I have to be content with her stolen knickers.