The guy walks down, sees Betsy -- she's not the best looking, but she would do. He puts it in and it's the worst feeling he's ever had on his dick -- like sandpaper and teeth. He pulls out and tells her. "Um. something's wrong, can you do something about that?" Betsy crinkles her face, then says, "Why of course! But it will run you another five bucks." She pockets the fiver and goes to the bathroom and is back in no time.
The guy puts it back in and now, it's the complete opposite: it's the best feeling he's ever had, and finishes in a flash. Panting, he asks her, "oh my god... that felt amazing... what did you do??" Betsy smiles, and says, "for the extra five bucks, I pick the scabs."