Kat.

Wyatt was dumbstruck. Kat was so blunt with her question that he didn't know what to say.

"It's not a hard question," snapped Kat. "You just say either 'Kat' or 'Kat' and we move along." She giggled at her own joke.

"But actually," said Kayla with a bit of a tremble, "I haven't done this before. If this is really happening, maybe he should be with you first." She shook her head. "I can't believe I'm saying that to my own sister."

Kat rose to her feet and put a hand on Kayla's arm. She winked at her and said, "it's okay, honey. I've always kind of thought maybe I was adopted anyway." She laughed again. "I'm fucking on fire, baby!" She slid herself in between Wyatt and Kayla, stretching herself upward, and gave Wyatt another rough kiss. "You ready?" With a glance down at his dick, she smiled, and added, "yeah, you are."

Kat put her hands on Wyatt's arms and pulled him to her. There was a small sofa with red velvet cushions to the side of the room, so the lot of them slowly moved in that direction. Kat walked backward, luring Wyatt to follow her (which he did). Kayla was a few steps behind, but didn't linger. She was still in the moment and didn't want to be left out.

Once they arrived at the sofa, Kat slowly lowered herself down, first sitting, and then lounging backward. Wyatt ogled her naked body, saw her looking back up at him. She had always been incredibly sexy, but he never actually got this close to having sex with her to think beyond 'she's kinda hot.' But here he stood, a raging erection, a naked Kat, lying there. I could just ... lean down and fuck her. I could just stick my cock into her pussy, and it would be ... okay? Wyatt thought. It's what she thinks I'm going to do. It's what ... I think? ... she wants me to do.

"What are you waiting for?" a voice said. It wasn't Kat, though. It was Kayla.

Wyatt turned around. "Huh?"

"What are you waiting for? She's right there. Go on. Do it."

Wyatt stood still for a moment.

"I want to watch you do it," Kayla said. "I want to watch you ... fuck her. I want to watch you fuck her." Kayla stumbled a bit saying 'fuck,' but once she got the sentiment out, it was clear. She was turned on by the idea of seeing Wyatt fucking her sister. "I don't know why, but I really want to see it. So go on. Do it. For me."

Wyatt thought it was odd that fucking Kat would somehow be more 'for Kayla' than 'for himself,' but either way, the time was now. He lifted one leg up onto the couch and half-straddled Kat. He held his dick in his hand, and rubbed the tip of it against Kat's pussy. He fingered her snatch, discovering it was very wet, very ready. He rubbed his dick back and forth along her labia.

"Don't tease me," said Kat. "Stick it inside me." She smirked at him, leaning her head forward a bit. "Fuck me, Wyatt. Fuck me now."

Wyatt did, however, tease her some more. He kept stroking his cock along the edge of her labia, almost pushing inside, but not quite.

"Do it, Wyatt," cooed Kayla from behind him. "Put it inside her."

Wyatt smiled. This was beyond a fantasy. Two gorgeous naked sisters, one begging him to fuck the other. He pulled his cock away from Kat and glanced over at Kayla. His expression basically said, this? you want me to put this inside your sister? He smiled, and again teased the outer boundaries of Kat's vagina with the tip of his dick.

"Oh my god," moaned Kat. "You've got me so fucking hot. I swear I might come the moment you put it in me."

Wyatt grinned again. He loved the notion that Kat knew he was going to fuck her, that Kat wanted him to fuck her, and that he still was waiting, creating tension, suspension.

Kayla put her hand around Wyatt's body, her fingers trickling down his chest and toward his cock. She held the base of his shaft, and steered him toward Kat's pussy. "Do you want me to do it?" she asked. "Do you want me to stick your hard cock inside my sister?"

Wyatt took a deep breath. He nodded, and then turned to Kayla and kissed her openly on the mouth, their tongues instantly intertwining. He instinctively brought a hand up to Kayla's breasts and touched them, squeezing and pinching them. As he fondled her, as he kissed her -- he felt Kayla moving his cock toward Kat. And without another hesitation, Kayla pushed Wyatt's dick into Kat's pussy.

The last boundary between them had been broken. Once he penetrated her for the first time, he took over from Kayla and quickly began thrusting and pumping into Kat. Fucking her felt so good to Wyatt, and he wondered why he'd never done this before. He'd always been so fixated on Kayla that he had ignored the reality of the sluttier sister and what had probably been almost freely available sex all along. Why did it take until tonight, until this weird auction-slash-party-slash-club to actually do this?

Kayla continued making out with Wyatt, letting him openly touch her, grope her, fondle her naked body. His fingers moved around her, eventually touching her pubic hair, and going further south toward her pussy. With his dick sliding in and out of Kat, his fingers took the lead on Kayla. He touched her clit, nearly vibrating his fingers against it. Kayla gasped, held her breath, and began to shudder. Wyatt could feel her body moving, almost pumping her own hips against his hand.

Still, all the while, he was pounding away at Kat. Wyatt could feel himself getting closer to a climax. He knew he had to slow down or shift angles or something or else ... Wyatt could barely come to grips with the fact that he was having sex with Kat. The idea of having an orgasm with her, of coming on her ... in her ... it was all almost too much to think about.

And then, as Wyatt thought about it -- this wasn't the path he ever thought he'd take. Kat was the easy one. Kayla was the girl he dreamed about. But here he was, literally balls deep in the wrong sister ... and on the verge of a climax.

Wyatt was shocked to hear the quiet voice of Damien in his ear. This is the auction. Wyatt began to lose grip on reality around him. It was late, he was tired, and this whole evening had been so strange.

Damien wasn't actually talking, though. Wyatt turned his head and the room felt empty, except for him, except for Kat.

The voice continued. Do you impregnate Kat? Do you abandon her? What about Kayla? How will you live with yourself, whichever you choose?