Take her to the other couch....

You stand up, suddenly, and so does Lucy, with a puzzled expression.
"What...Oh!!" She exclaims as you grab her around the waist and hoist her up onto your shoulder. She's not exactly petite, but she doesn't weigh more than Jenna, so you manage her fairly easily.
"James..you stud..." she purrs, head down by your lower back. You take advantage of her position to smack her ass, and she yelps.
Watching Jack as he slides inside Ana, you march over to the adjacent couch, which is set up perpendicular the one that they are fucking on. You drop Lucy onto it, reaching down to peel off her thong and spread her legs.
"What..what did I just say about the couches, James?" Lucy protests, but it doesn't feel heartfelt, and Ana's little moans are making you both lick your lips. Lucy reaches over her head to grab Ana's hand, and she smiles.
"Well...it won't be the first time...I've had to apologize to Dad..." Ana laughs, leaning over to kiss Lucy as Jack begins to pound her pussy doggystle. Not be outdone, you slide into Lucy's slick hole, shuddering at how good it feels to stick your dick in some strange.
"Oh...gggggood....." Lucy squeezes Ana's hand, lifting her legs up to rest on your shoulders. "That's the good dick..." Her eyes glaze over. Ana is yelping and panting, pitching forward with every thrust from your brother-in-law.
You piledrive Lucy, really slamming deep, and she starts to scream. "Fuck! Fuck! Fuck me! That's so deep! Oh it hurts...."
You slow down. "I'm sorry..."
"Don't fucking stop, James! I can take it!" Her eyes light up. "Beat up that pussy!"
"D..D...o.. it..." Ana says. "Wreck that pussy." She reaches over to pull on Lucy's hair. "She's not satisfied unless she can't walk.."
You continue to pound mercilessly, egged on by both girls, until Ana shudders, reaching back to rub her clit. "I'm...shit... I'm coming...oh....!!!!" She quivers, collapsing onto her face on the couch as Jack spears deep and fast.
"Me...toooo!!!!" Lucy wraps her legs around you as you pound her spot, eyes rolling.
You and Jack sit back at the same time as the two ladies pant and wheeze, lost in the throes of orgasm.
Jack eyes Lucy, then looks at you, making a motion with his fingers that says "Switch off?"
You nod, and you quickly switch couches with Jack, putting Ana on her side and lifting her leg to slot yourself in position. Jack rolls Lucy over, face on the armrest, laying out almost flat on her prone body, spearing his cock into her pussy from behind and above.
"Oooh....what the fuuuuuuckkk...." Ana moans louder than she had before, her eyes popping. "I wasn't ready...for...this..." she turns to stroke your chest. "Damn... you have a big dick."
"Hey." Jack says as he bounces on Lucy's ass. Lucy looks almost half-asleep, her eyes are still glazed over and she's only giving little whines of pleasure every few seconds.
"No offense meant Jack. You have a nice... dick....tooo....fuuuuuck...." Her eyes pop as you hit the back, nudging against her cervix, careful not to punch it too hard.
Lucy smiles drunkenly, reaching over to grab Ana's hair. "Enjoy it you little twat. Neither of us will be able to walk now..ow..ow...."
After several more minutes of fucking, Jack starts cursing, pulling out to spray cum on Lucy's ass. "Shiiiittt!!!!"
You smile, realizing that you could go for a bit longer. It's nice to know you can outperform the slick, well-dressed douchebag. You flip Ana onto her knees, and grab her arms, holding them like reins while you pound her pussy.
"OH FUCK!FUCK!FUCK!FUCK!" Ana's belting out her screams, and Lucy comes over to stick a tongue down her throat while you ride her like a bucking bronco. Your own orgasm builds, and you decide you are just going to shoot inside the little tart.
"Here it comes, baby...." With a hard thrust, you empty into Ana's quivering cunt.
You collapse back onto the couch, and Ana goes limp, panting.
"Not on the couch!" Lucy rolls off onto the floor, desperately seeking Ana's leaking snatch, doing the only thing she can: sucking up your cum from her hole before it can stain the couch.
"Wow...you really didn't want that to happen, huh?" you laugh, and Lucy shows you her mouthful of your baby batter, before swallowing it down. "Tasty, and no mess! Win-win."
Jack looks like he's going to pass out. "Fuck... I need a nap, now. That was crazy."