Okay so, here's a true story from yours truly. First off I have to say, I am gay, so it's not likely you'll see me post about a girl in these forums. But as this is the true story section, there was one incident in which I had tied up my step sister. I was around 15, she was 11 I think? It was a few years ago so my memory's not the best. Anyways I remember this clearly because it was on Halloween night. It was 3 in the morning, our parents were in bed asleep, and the two of us were sitting on her floor eating candy and watching TV.
She was being really bratty so I messed with her a little, teasing her, messing up her hair, taking her candy and throwing it across the room, little things like that. Things got more serious when she decided to tackle me. Well, being a 15 year old guy, I was stronger than her 11 year old self. I pinned her to the ground. I didn't tie her up, but she was in complete submission.
I have a foot fetish so I had a brilliant idea on how to torture her. Holding her still on the ground with one hand, I used my other to take off my sock. I had been intentionally wearing the same gray socks for nearly 6 days and they were pretty smelly. So I pressed them against her nose and kept it there for several minutes. She was too embarrassed that she refused to scream for help. I'd be embarrassed too. "Moooooom, my brother is making me smell his soooock!" Yeah, if she said that she'd probably die of embarrassment.
Over ten minutes had passed. She had no choice but to inhale through my sock in order to breathe. I released her. She was pretty pissed off. If only I had something to keep her tied up so I could have done it a lot longer.