Double penetration

Emily slurped and swirled her tongue, reveling in giving her brother a blowjob in front of his two friends. Her bikini-clad ass wiggled cutely in the living room as she worshiped her brother's cock.

In the meantime, Aiden won the next game and raised his arms in triumph.

"All right!" he exclaimed. "Emily, stop wasting time on your lucky fucker of a brother and come over her so that Chuck and I can fuck you properly. We're gonna stuff you with cock until you are air-tight and pound you into putty."

Emily's knees went weak at the thought of giving so much pleasure to her brother's friends, but her mouth mourned letting go of her brother's wonderfully musky cock. Still, she tore herself away and crawled across the floor like a proper little slut to worship two more cocks.

"Hey," Steve spoke as her sister slurped down on his friends' cocks. "Some ground rules. Fuck Emily's ass and mouth all you want, but her pussy is mine."

"So," Aiden murmured, "Let me get this straight. Your sister's pussy is off limits, but I can fuck her ass much as I want?"

"Yep."

"Fine by me," Aiden answered and grabbed for Emily's string bikini.