Making the Team/Bring Mary, keep watching
As much as you don't want to admit it, watching your baby sister be manhandled like some worthless fucktoy has both horrifies you and excites you. You feel your cock stirring in your pants, and your hand slowly slides inside your underwear to grasp your slowly hardening penis.
Through the window, you watch as Mary is forced onto her knees. Her shirt has been ripped off of her body, leaving her only wearing her panties. You watch, unable to look away as your sister, clad only in her pink panties with little hearts on them, is forced to open her mouth for one of the boy's erect cocks. You can see him grab her hair, forcing her face into his pubic hair. You can see that due to the whole ordeal, it appears that all of the fight has left Mary. She's completely at their mercy.
The boy with his cock in your 9 year old sister's mouth begins to thrust in and out, using her curly hair as handles to viciously fuck her face.
It doesn't take long for the boy to withdraw his cock, and begin to pump it with one hand, holding your sister's head still with the other. You can hear the boys instructing your little sister to open her mouth, and to swallow.
Mary looks confused, but she does as she is told. A second later, and her face is being showered with cum from the boy who just fucked her mouth. Streaks of thick white cum coat your baby sister's face, with much of his cum being shot directly into her tiny little mouth.
When he stops, Mary closes her mouth and swallows, just like a good little girl. When she's done swallowing the mouthful that was given to her, her face perks up and she begins to lick her lips. From what you can tell, she absolutely loves the taste of cum. The boys begin to praise her, and she smiles brightly, if also blushing a bit. Clearly she is confused, but not freaked out or afraid, perhaps even a bit proud or happy. So, what to do you do now?