Tie Livia's robe over her head.

You lift up Livia's robe and tie it into a knot over her head, forming a kind of black bag in which her arms and upper body are trapped. You make sure to get enough cloth into the knot that her tiny breasts are free to bounce around in the open air, but not so much that she can easily wiggle free. It's not the first time you've done this, of course, and you're pretty good at it by now.

You let time return to its normal flow. Immediately you hear squealing coming from inside the bag. Livia scampers around, darting left and then right, briefly at a loss for words. She can't cover herself and she can't see where to go, although she can hear the whole tavern laughing at her. She stumbles toward the edge of a table and falls across it, bending over the table with her bottom high in the air while everyone whistles and cheers. Only then does she find her voice. "You... you utter bastard! Why would you do this, creep!"

You place a hand in the small of her back, preventing her from getting up. "In a magical duel, the winner gets anything they want. This is what I want."

"You can't be serious! No!"

The flat of your hand connects with your bottom. "To be specific, Tinytits, what I want is for you to get a nice firm spanking in front of everyone. Also, your new name is Tinytits. Because you have tiny tits. Get it?"

"No!"

"Really? I thought it was pretty easy to get."