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What if my sister-in-law keeps wanting sex?

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recently my sister inlaw stayed for a few days as my wife went to portugal for a wedding as I was working we needed someone to look after the kids,everything was going alright until one night she came in to my room and in to my bed naked,we had sex and now she still wants more,I still regret the first time it happened,but she keeps saying if I dont she will tell my wife,what should I do help me please