YRNKMTNDVAJ-397 - My wife's sister is seducing me right under her nose!

My wife's sister is staying over for a few days, and she's become an incredibly seductive woman. I couldn't help myself and crossed the line. Now, she's the one seducing me, whispering in my ear and teasing me while my wife is just in the next room. I can't resist such a young, firm body, so we've been having incredible sex for the past 6 days.