Just a little background. I've known my sister-in-law for 9 years. This happened last summer.
My wife and I bought a beach house a couple of years ago. We are literally 200 steps away from the nearest beach. Not only is it close to the sea but it also has a roof terrace. My S-i-l is 10 years older than me but is very attractive, blonde, 5'8" with a petite body. Over the years I have fantasized about her removing her bikini in front of me. Needless to say that led to some pleasurable me-time.
Last summer she came to visit. We had a nice family day at the beach. In the evening we had planned to go out and grab something to eat. She had a shower at our place and forgot her black bikini in the shower. When it was my turn to shower I saw her bikini. I couldn't resist. I wrapped it around my cock and gave myself a very powerful orgasm.
After showering, and carefully cleaning the shower, I hung out to dry both my trunks and her bikini.
The following day I went to work and on my return I saw on the sofa a plastic bag with her black bikini in it. I made sure nobody was at home, closed the curtains, pulled down my pants and started cock-butting both the inside and the outside of the bikini. Both the bottom and the top. Fortunatelly enough my cock was dry so I didn't leave any pre-cum stains. After fiddling for a couple I put the bikini back in the bag. Eventually we returned it to its rightful owner.
The following week I saw my S-i-l wearing that same bikini. Little did she know that my cock had rubbed the bikini that now was covering her vagina, ass and boobs.
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