Slick
How much do you want to see her tits?
In the past I have gambled for a living so I have a little insight here.
Make a wager and let her win for a nominal amount say $10-$25. Double it and let her win again. Maybe you do the first one for $10, the 2nd for $20. 3rd bet double it again. If she loses she's sends a photo of herself topless (preferably face showing). Post the bet here and allows us enough time to get you enough likes to win.
Post the picture here, of course.