embarrassing you, your mates or your siblings...
I spent the night at my Aunt's house with all my cousins. We had sleeping bags and slept in the floor. Being a young lad I was always hard and horny. So that night when everyone went to sleep I jacked off in my sleeping bag. The next morning my cousin teased me about it. I was embarrassed and just played dumb.
I went to a friends house when I was 14 and was the first one to fall asleep. They put my hand in warm water and I pee the bed. They also put toothpaste between my fingers and in my ear. The worst thing that they did was wrote all oer me with black marker.
My sister is eight years older than I am, when she was around seventeen and having a sleepover with like five of her friends I was bugging the crap out of them. They held me down and my sister said you make any loud noises and I will punch you right in the balls, she took off her underwear and rubbed her pussy all over my face thinking I would hate it. They let me up and I walked back to my room smiling from ear to ear wishing she would have not stopped.