The two take Marnie literally. Katie and Stephen share a conspiratorial glance. They put their glasses of wine on the coffee table, then Katie says, "Grab her." In moments they have her spreadeagled on Stephen and Marnie's bed. Stephen opens the bottom drawer of the nightstand and begins tossing items to Katie. Soon Marnie is bound and spreadeagled on her bed.
Katie leans forward and locks lips with Marnie in a sloppy, passionate kiss. "You want us to lick you out, hmm, sis? No problem." She slides a gag into her sister's mouth. Then she and Stephen start stroking Marnie's slit, their hands rubbing over her labia and each other, sliding in and out of her in an irregular rhythm. Marnie gasps and bucks, straining against her bonds. Mews of pleasure slip past the gag. While one of them strokes her, the other takes a moment to shed their clothing.
Katie takes the first shift. She straddles her sister's chest, her ass and her own wet pussy mere inches away from Marnie's face. She bends over and begins planting tender kisses on her sister's trimmed mons. Katie's tongue gradually explores the topography of Marnie's mound as it makes a slow, meandering journey down to her outer labia. Katie eagerly inhales the musky scent of her older sister's juices. After a long afternoon of moving and unpacking boxes, not to mention the aggravation of clothes stimulating her, Marnie's vagina is dripping with lubrication, and her clit is an angry red bud. The tension in Marnie's body is palpable, and Katie aims to relieve it.
Not to be left out now, Stephen produces a big black dildo from the bottom drawer. He holds it up in Marnie's field of view. His other hand grabs one of Katie's ass cheeks and squeezes before travelling downward to Katie's cleft. He spreads Katie's lips open to give Marnie a better view and then slides the dildo into her sister's pussy.
"Ohh!" Katie exclaims. "Mmm, that's good. Put it all in there!"
Stephen happily complies. Soon the dildo is sunk up to its base in Katie's cunt. He leaves it there, focusing both his hands on Katie's asshole. Marnie has **** but to watch as her boyfriend sticks one, then two, then three of his fingers up her sister's ass. The 18-year-old squeals with delight at this attention to her posterior but does not allow it to distract her from her mission.
Years of experience eating out her sister helps Katie bring Marnie to orgasm in less than five minutes. As Marnie cums, Stephen and Katie switch roles. The former kneels at the edge of the bed, while the latter, dildo still inside her, turns around so that she can look Marnie in the eye. She squeezes each of Marnie's nipples, eliciting further gasps of mixed pain and pleasure from behind the gag. "Mmm, we can do better than that, I think," Katie says. And so she leans forward and takes one of Marnie's nipples in her mouth.
With both of them now licking and sucking her most sensitive, erogenous regions, Marnie sinks into a state of pure, instinctive bliss. The tension drains out of her. She stops straining against her bonds. With each orgasm her body relaxes further. At some point Katie removes the gag, but before Marnie can say anything, she silences her sister—first with a kiss, then with her own breasts. The two of them take turns licking and kissing each other's tits.
Stephen eventually gets bored with eating pussy, however, and has some ideas of his own about what to do with the two nude girls on his bed, their wet holes positioned so conveniently one above the other. With a flourish of his hand, he removes the dildo from Katie's pussy. Without stopping, he grabs her hips and inserts his penis in the gap as a ready replacement. Katie isn't expecting the penetration, and she lets out a low, rumbling moan. Her already tight vagina constricts even further around Stephen's member, and he grunts with satisfaction as he thrusts in and out. He builds up speed, then just as Katie seems to start taking him for granted, he pulls out and plunges into Marnie's pussy. He alternates between the two women in this manner for several minutes until his cock shows signs of cumming.
Katie rolls over so she is beside her sister, positioning her head right next to Marnie's. "Right here, Stephen." His only answer comes in the form of ropes of white jizz that splatter her forehead, eyes, and nose. Another shot covers similar territory on Marnie's face. By the time he's finished, the sisters are happily covered in his cum. He pauses to catch his breath, then he slips Marnie free of her bonds so that she can pull Katie into a tighter embrace and lick her sister's face clean of her boyfriend's seed. For his part, he just sits back and enjoys what will soon be a regular post-coital show of the two women cleaning themselves after he has used them.
The threesome has defused any sexual tension that might have lingered given that Marnie and Katie are used to making out with each other and Marnie walks around the apartment in the nude. It's clear now that even though Katie might sleep in a different bed, she is going to be sharing Stephen and Marnie's often throughout the week. The genie is out of the bottle now, and Marnie is ready to accept her sister's role in her and her boyfriend's sex life.
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