I had something like this happen to me the other day with my wife. I wouldn't worry about her cheating on you, for me it ended up being one of the greatest moments in our relationship and rekindled our marriage.

The other day I was laying in bed reading my new Stephen King book when my wife of the past 4 years walked in wearing the most stunning rose red lingerie with a whip in one hand and handcuffs in the other hand. Before I could sit up all the way she had already flung me back down onto the bed and began to cuff me to the bedposts. I had never experienced a thrill like this in my life. Our sex life, while not totally active, could best be described as vanilla. As she cuffed my first wrist into the bedpost she flipped me over, stomach down on the bed and cuffed my other hand to the other post. At this point she crawled on of me and began to grind on my bare ass, occasionally whipping me and reaching down to fondle my balls. Being able to feel her wetness through that lace red underwear grind against my ass and not being able to do anything about it was the most erotic thing I had ever experienced. Once she got me begging for it, she stuffed my mouth with a ball gag, blindfolded me, and began whipping me all over, still teasing me. She leaned down and whispered into my ear that she would be right back. It must have been only 5 minutes, but the wait to feel her touch again seemed like an eternity. Finally I hear her come back into the room. She spanks my ass hard enough to leave a mark, I mumble with pleasure though my gag. That was when I felt it for the first time, her strap-on. At first I struggled and squirmed, it was different, cold, uncomfortable. I panicked but yielded enough to not tap out with our safety word ("diggle"). After a minute I began to relax a bit, it felt astoundingly good and my grunts of pain soon turned into moans of pleasure. I wanted to grab into the sheets but the handcuffs kept me locked. I was completely at her mercy in what was becoming the greatest night of my life. Slowly she kept working me with the strap-on and to my surprise I began to feel myself at the early stages of climax. I had only heard stories of men achieving orgasm this way, but didn't believe it was something the inexperienced could enjoy. But there I was, face down in this pillow, gagged, and sitting on the edge of an orgasm for what felt like 10 minutes. Finally everything came to an end in an orgasm so strong that my entire body convulsed and shook. I was blindfolded but I know I wouldn't have been able to see anyways. It was as if my entire body was being shaken violently by a giant's hand. I'm able to shake off my blindfold and turn my head enough to look at my gorgeous wife. She looked down at me and said "That'll be about tree fiddy." Well it was about this time I noticed that this girl scout was about 8 stories tall and was a crustacean from the protozoic era!"