I was around 18 years old, and I loved tying up, blindfolding, and suffocating my girlfriend. Once, after we'd had sex, I removed the handcuffs, and she desperately ripped off the blindfold, her eyes scanning the room. Then she asked me, "Who fucked me?" You can't imagine my surprise. I was so shocked. In my girlfriend's mind, a stranger had fucked her, and she hadn't objected; in fact, she'd enjoyed it. Incredulous, I asked, "You thought a stranger fucked you?" She ignored my question and avoided the topic, never to bring it up again. But something changed in me. Her imagined infidelity didn't bother me; in fact, it excited me, and to this day, it remains one of the fantasies I'd like to fulfill.