Slept with sis-in-law, should I tell my wife?

My sister in law just turned 40, and she has been dreading it. Sh kept saying she was getting old and she wouldn't look hot to men anymore. I don't know why she looks fabulous but she was taking it hard. My wife kept saying its a woman thing. Last week my wife left town on business, so I was home alone. My sis in law asks me over for dinner. This isn't uncommon I've been over to her house for dinner before when my wife has traveled for her job, so I said yes. Sis in law makes a nice pasta dish and wine. Lots of wine. We both get pretty loaded on the wine, and she then comes on to me. I wish I could say I stopped her but I didn't. We ended up having sex and I spent the night. I can't really blame it on the wine because the next morning we had sex again before I left. Now I feel tremendously guilty , as I know I should. Sis in law said she'd never tell which I'm positive she won't, but I think I need to let my wife know. We've been married for thirteen years. What do you think?
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  • You should tell her ! And you should have your bags packed ready to leave !!

  • I hope if you tell her , she sets your penis in fire

  • What the eye doesn't see the chef gets away with

  • Nice try!