I did this once when i was 18-5 and on a flight across the world. it was sooooo hot. i was the bottom back then and the guy next to me was a muscular jock and i just kept getting hard everytime he flexed.. i'm sure he saw it and squeezed my leg under the blanket, stroked me up a bit, and told me to walk to the spot depicted in the pix. it was so hotttt...
