Once when I was about 20 years and my cousin was about 14 years. she was passing by my flat. She used to stay on upper floor. I just tickled her and teased her.
She came in the flat to revenge. I fall down on my bed and while doing mischief I grabbed her from back and caught her b****.
I felt ashamed later of this act.
But I could not control my teenage s** drive. She also enjoyed and we did this s*** fight at least for half an hour and then I left her.