Step-Sibling Pact: Show Your Boobs to Get His Help

Step-siblings negotiate a bold bargain: he will help with a problem if she reveals her boobs; she complies to seal the arrangement.

Her step-brother offers to help with a problem on one condition: she shows him her boobs. After a moment of hesitation, she lifts her shirt to reveal them, and he honors the bargain by providing the promised assistance.