Legal\Return to your room and grab your pocket knife
You sneak back out of her room and to your own, scolding yourself for not thinking ahead. You grab a 5' pocket knife off a desk and sneak back into her room as stealthily as before. Unfortunately, as soon as you quietly close her door, she stands up and stretches, then spins around and sees you standing there. You nonchalantly keep the blade out of her sight.
"What do you want big brother," she sneers. You can't help but get excited by the prospect of how fun this will be.
You clench the knife and force a smile, "Just wanted to ask you a question, little sister."
She raises her eyebrows impatiently, what do you say
Ask "Does it feel good knowing you'll die a bitch" and lunge at her with the knife
"I... uh... do you mind doing a photoshoot for... a project I've started?"