Threaten

You spend a minute working the stiffness out of your jaw. Then you glare at your sister.

"What the hell do you mean - 'need to find out'? You're not finding out anything. Untie me right now, or you're going to be in big trouble."

"Why did you make me... Why did you tie me up like that? All you were supposed to do was see if I could get free. Instead you - well never mind what you did. Are you listening to me you little shit? Untie me NOW, or I'm going to make you regret this for the rest of your life."

Amy stands and listens to your tirade, the smile slowly fading from her face. "You think you're so smart, don't you? Big sister, all grown up. Ordering me around. 'Amy do this', 'Amy do that'. You think you're so clever. But look at you now, all tied up."

She sits on the sofa and looks at you. You're outraged that you kid sister would dare do this to you. You try to move, but gasp as the crotchrope slides against you.

"Ohhh... Listen, you little shit - untie me now. NOW!! Or you're grounded until Mom and Dad get back. Do you want to spend the next three months in your room?"

Amy looks at you, clearly shaken by your threats and trying to decide whether to free you.