I Got Pantsed Revealing A Thong

This story began at my 22 Birthday. A friend of mine called Sarah gifted me a pink g string for men. She did this out of fun to laugh about something. A few weeks later she came to me and we drunk a little bit, later that evening she said to me, that I wouldn‘t have the guts to wear the pink g string in front of her. As i was drunk i took it as a challenge and went to the bathroom put the g string on and got back out. When she saw me wesring nothing but the g string she laughed but couldn‘t keep her eyes off me. She then said it would look kinda good on me. As i turned away to put my clothes back on, she spanked me really hard, I even got turned on! A few weeks later Sarah and I went to run in the forrest. I wore thighs and underneath it i thought i could wear the pink g string, because to my surprise it was very comfortable. So as we were running, I did some pull ups, that was her moment she yanked my thighs down exposing my pink g string, to make everything better she even yanked the thighs off me, I was standing there red faced in just my g string. She laughed out loud and couldn‘t hold herself back. She liked every part of it, because i was very embarrassed. Then she began spanking me which turned me on even more, as she saw that i got a boner she ran away even further, I followed her but quickly got lost. As I was walking, still in this pink g string i heard two voices behind me they stopped speaking and laughed very loud. I turned around and saw two girls standing there taking pictures of me!! Then Sarah came back and gave me my thighs. She tells me this story every time we meet and wants me to wear a string more often!