You have strong arms, so you thought it would be a good idea to challenge your bully to show your gf what a man you are. You were wrong. Your bully knew what he was doing. You paid a high price for your loss.
Welp, it happened again. When my arm was raised on the train, I caught a hungry bloke staring at my peekaboo armpit hair. He covered his bashful grin with his hand, but he clearly wasn't shy... since he gave me his number before leaving the train. Guess