Get a blowjob from her

While having Emily gagged has its advantages, you want more interaction with your scared victim and start by removing her gag

"Why are you doing this?" She immediately asks with her lips trembling.

"Because..." You give her a wicked smile "you deserve nothing more than being my fucktoy." You reach out and pinch her upper lip with the thumb and index finger "And I removed that convenient gat not to listen your stupid shit" you shake her plump limp from side to side "I will fuck your pretty mouth now" you take your hand away and start looking around searching for something to stand on.

"Please, stop this insanity!" She begs only to get an immediate hard slap in the face.

"Try to call me insane one more time. I fucking dare you," you notice another chair, slightly lower than the one to which Emily is tied. "That will do"

You drag the chair and jump on it in bringing your groin to the level just above your sister's lovely face. You proceed by grabbing her hair and throwing her head back. "please..." She begs

"Open up! Open up before you make me angry" you order as you bring your bloody dick to her lips