Tell him you'll give him the spunky sock as a souvenir, but he has to do something for you first
From Create Your Own Story
You look at the clerk and say "I'll let you keep this sock, as a souvenir, but only if you'll do something for me in return."
The clerk eagerly agrees, saying "Anything! I'll do anything for it!" His dick rapidly stiffens at the prospect of fucking your feet again.
You reply "Ok..."
