No

You reach for her arm, but as the cum fills your mouth you are overwhelmed. Your hand diverts from the path you wanted it to take, and shoots down into your cunt. Your mind rebels as your body takes control. As your sister removes her dick from your mouth you lick it, making sure to extract every bit of cum. As you swallow the last of her load, you feel the floodgates of your body open. For doing such a good job, your body pushes you into a orgasm and you fall to the floor, spasming and moaning loudly as your sister looks down at you.

As you both ride the after glow, any thoughts of resistance fade away in wave after wave of orgasmic bliss.