A twin killing...

"Ah..AH...!!! Ow!! Fuck...." Lucy bellows as you push inside her tight ass.
"What's the matter?" Ana smirks. "Everyone knows you're a buttslut, Luce."
"Fu...he's...awww!! Thicker than mmm......ost......" her eyes are squeezed shut as you push further in.
"Should I stop?" You ask, and Lucy's eyes pop open to look at yours.
"...no.... just be.... gentle...I'm not used to something that thick, baby..." she smiles, though her eyes still hold pain.
You spend several minutes probing and prodding, advancing and retreating, all the while Ana kisses Lucy and rubs her tits, her clit and sticks fingers in her mouth, all the while shaking her ass in your direction. Eventually, you work Lucy's sphincter enough to comfortably pump in and out. Ana provides some salivary lubricant, and you begin to drill for oil as Lucy begins to babble; her eyes rolling up and her hands gripping her asscheeks to part them for your thick rod.
"That's it, Luce. Take that cock in your ass, girl. I love watching a guy plunder your booty!" Ana giggles, and you snake out a finger to work her snatch, rubbing a thumb against her own asshole as well.
"Ooh... don't get greedy, James..." Ana coos, looking back at you lewdly. "Isn't one tight knot enough for you?"
"Nothing's enough for me, Ana..." you pant, really working your cock in and out of Lucy's rear with purpose now.
"Jesus...fucking....christ....I'm....." Lucy is rubbing her pussy furiously. "I'm going to cummmm....." You pick up the pace, and Lucy squirts, soaking the mattress with her feminine juices. Ana leans down to lap it up, laughing.
You pull out of Lucy's asshole with a naughty little "pop". She collapses forward, and Ana plants herself between you, ass in the air, cleaning Lucy's snatch with her mouth.
"Was it good, Lucy?" Ana says into her quivering hole. Lucy gives you a look over Ana's head, and you nod. You know the play.
Lucy suddenly seizes Ana's arms, pulling them straight out to either side and planting the girls face into the mattress.
"Wha..." Ana is confused for a second, until you position yourself over her raised rump, pushing apart her asscheeks.
"Your turn, Ana." Lucy laughs into her ear. Ana squirms, but you smack her ass hard and pin her waist to the bed, pressin your cock head into her tight sphincter.
"No....." she squirms even harder, but Lucy grabs a handful of her hair.
"You know the rules, bitch. Don't try to fight it. You knew this was coming." Christ, you think. They must have some really fucked up sexual dynamic going on. You aren't complaining. You push on into this new asshole with purpose, and Ana's wails begin to come fast and furious.
"AWWW!! Oooooh!!! Ooooaaaahhnnnn!!!!" her face is scrunched in pain, eyes tightly shut and mouth turned down, until you pass inside, and her eyes and mouth shoot open, and no sound comes from her mouth but a faint, high-pitched whine.
"Don't let her fool you, James." Lucy laughs, spitting on Ana's face and rubbing it in the puddle of wetness on the bed. "She's a buttlsut too. And she's more degraded than I am. She likes to be treated like shit." She puts her face close to Ana's. "Isn't that right, you little whore?"
"....yes....." her response is faint.
"See?"
You just shrug. "I can do that."
You spend then next six minutes or so abusing the hell out of Ana's asshole, pinching and slapping her ass, twisting her nipples, watching in glee as Lucy tries to suffocate her with her pussy. Ana's cunt runs constantly with sticky cum leaking down her thigh. She's loving every moment of the mistreatment.