Something degrading

You're glad that the restraints popped up because otherwise you're not sure you would have made it through. But true to her word, the tattoo only takes Nat ten minutes. By the time she is done you are panting from the experience, but still rock hard from the combination of pain and humiliation.

The restraints retract into the device and Nat comes up with a mirror so you can see your new tattoo.

There on your ass, in large bold letters, are the words "Free use cock"

You blush as you see the tattoo, then look at Maddie smiling smugly at you. Before you can think of what to say, she says "Anybody should be allowed to use a nice cock like this" and grabs hold of your shaft. "I just wanted to make sure the whole world knows it" She gives a little wink.

Maddie looks back at Nat. "Great job Nat, hope to see you again soon." And then she turns and leads you by your cock to the next station.