Swing at her head
From Create Your Own Story
Not wanting to lose again, you decide to take the offensive. You draw up all of your training and concentrate on what you're going to do. With out thinking you rely on your instincts and take you best aimed swing at her head.
Unfortunate for you she sees this coming long before you even make the swing and ducks out of the way. She then ducks down to the floor and kicks your legs out from underneath you, and sends you crashing to the ground. She follows up by hitting up in the face as hard as she can, causing you to blackout.
When you come back around your sister is standing over top of you with a victorious smile on her face, "Well it look like you've lost yet another fight sister, I'm win so i get to choose your punishment. Oh and i do hope that you don't mind but I took the freedom of undressing you so that you'de be ready."
You look down at your body and realize that she did remove what little clothing you had on, and now you were lying on the floor completely naked, with all of your sisters standing around waiting to hear what your punishment will be. You wonder to your self what kind of thing will she do to you this time.
"Now, now, now. What shall I choose to do to punish the naughty loser?"