"Ready to go, one last time?" Taylor asked, of all of them -- of Shaun, lying blindfolded on the bed, his face wet with their juices and his achingly hard cock exposed before them all; of Sherrie, naked, trying to catch her breath; and of Christine, as she stared at her brother's enormous hard-on, eyes wide and unblinking, a finger unconsciously touching herself through her shorts.
"I'm ready," Shaun reported. He was loving this. Pussies, mouths and tongues galore -- and all the while, Christine was watching, seeing him, loving it. He hadn't heard from her for a while; as he was blown by an unseen mouth, he toyed with the idea that maybe the mouth was Chris's, maybe she was sucking him off, sucking his cock. But no: he knew she wouldn't. He might harbour more than a few deviant, lusty feelings for her, but he knew she was better than to do that. She was a better sibling than him. Still: he couldn't help but fantasise...
Taylor looked to Chris; Chris made up her mind, and nodded. Taylor grinned, and as Chris approached the bed Taylor went and sat astride Shaun's face, ready to lower her pussy back on to his waiting lips. Chris moved quickly, before she changed her mind: she kneeled down alongside the bed, staring Shaun's massive cock in the eye, her heart thumping like a kettle drum, her hands and knees shaking with nerves and excitement.
Taylor looked at her, and nodded; she lowered her pussy back onto Shaun's face, and for a moment she and Sherrie held their breath as Christine paused; then Chris reached up, grabbed Shaun's cock gently by the shaft, and she went down on her brother.
Shaun's heart leapt, straight away. This mouth... this mouth felt different. He hadn't been blown by Sherrie for a while, Taylor had taken him twice in a row now, but this mouth... was it... could it have been... Christine?
Chris couldn't believe what she was doing. She was actually doing it. She had imagined it, dreamed of it for years, and now she was actually doing it -- she had her hand on one end of her adopted brother's cock, and her mouth on the other. The warm, meaty taste of it was just as she imagined; the thing was huge, so much bigger than Peter's, she could only go half-way down on it with her mouth and she had to strain to keep her mouth wide enough, her teeth off it. It was so warm, and so hard; she felt it grow in her hand, and she had to move with him as he gently shuffled his hips in an unintended, helpless thrusting motion.
'Is it her?' Shaun asked himself. 'Is it... is it Christine?' He tried not to let himself to think it, he tried not to think the thought, but he couldn't help it: this action was different. It was lighter, gentler than Taylor, but not as hesitant, not so inexperienced as Sherrie; there was almost a tenderness to the unknown mouth's action upon his cock, a tenderness bordering on love... 'I think...' he thought. 'I think it is... oh man... I think it's her! I think my sister is sucking my cock!'
As Chris kept sucking, without shame, with growing joy and abandonment even as Taylor and Sherrie looked on with amazed fascination and their own mounting arousal, she couldn't stop herself: her hand went into her pants and found the sopping wetness of her pussy, and the sensation felt like never before as she ran her fingers all over it, probing about and over her throbbing clit and around and into her hole which almost ached for attention. She touched herself, rubbed herself, pleasured herself even as she kept sucking, sucking away at Shaun, sucking at her brother.
Shaun's excitement was mounting, doubling up on itself. 'She's doing it...' was all he could think. 'She's doing it...!' He hadn't thought he had another orgasm in him so soon after fucking Ms Tiann, but he was wrong: an orgasm was there, and it was building, it was mounting very quickly. Shit: he'd better warn her... "Mmm mm-mng..." he said, muffled by the pussy upon his face -- could it have been Christine's? No, he knew the taste, it was Taylor again. Imagine if it had been Chris's, though... oh God... "Mmm mm-mng!"
Maintaining the silence, Taylor and Sherrie shrugged at each other, trying to figure out what he was trying to say; it finally occurred to Taylor to get off him, but it was too late, and his head fell backwards as his hips heaved and he shot a heavy load all over the back of Chris's throat. But she didn't mind -- she was ready for it, she wanted it, and Sherrie and Taylor watched with stunned amazement as she drank her brother dry, bringing herself to a massive orgasm even as she did so, her hips bucking and pounding back against her own hand; the taste of his come, her frenzied fingering, the way he came for her and only her -- it tipped her over the edge, and they both bounced and writhed as she came, and he came, and they came together.
Eventually they were both spent; Shaun was emptied and ready to come up for air, and Chris gasped with shock and reaction at what she had done. Taylor gestured wildly as Shaun reached for his blindfold; they all leapt for cover, standing well clear and behind Sherrie, staring at him as he defeated the blindfold and looked to them.
For a moment, they said nothing. Then he asked, "...who was it?"
Chris's heart froze. He was looking at her. He was looking right at her. He knew. "Who was it?" he asked again. He asked of her.
"Well..." said Taylor. "It was me on your face..."
Christine stood silent, aghast, terrified, unable to read the look on his face as he stared at her, as he searched her face for the answer. "And it was me on your cock," Sherrie told him, stepping in, saving Chris.
Shaun frowned at Sherrie -- was it? Oh. Of course it was. "Of course it was," he echoed, and they all breathed a sigh of relief, the girls and Shaun. "I can't believe I didn't pick it," he added.
"Okay then..." Taylor said, shortly. "...goodnight!" As one, the girls picked up their various discarded garments and fled for the safety of Chris's bedroom, leaving Shaun to bask in a slightly confused afterglow.
'Sherrie...' he thought. 'Sherrie...' It had to be her. It had been different to her first attempts, but she could have improved -- couldn't she? Perhaps Chris had given her some pointers -- maybe that's why it felt different, different to Sherrie's first goes, entirely different to Taylor's rough-and-tumble, pound-away method. 'As if it would have been Christine,' he thought, chastising himself. 'You've got to stop thinking about your sister like that, man. You've got to stop.'
* * *
Safely back to Chris's room after a short nudie-run through the hall from Shaun's, Taylor and Sherrie giggled and babbled at what they had done, what they had seen, what Chris had done with her brother. But Chris's face was white with shock, and she sat heavily upon the bed. "Oh God..." she whispered. "What have I done?"
"Chris..." Taylor said, suddenly full of caring concern. "Honey... that was beautiful! That was the most tender, erotic, arousing thing I've ever seen!"
"I touched myself as I watched it," Sherrie confessed. "You two were so beautiful together, I came so hard, I've never come like that before... I hope you don't mind..."
"I never imagined I'd see anything so... so hot," Taylor breathed. "Chris, the way you went at him -- there was so much love in it, you could see so many pent-up desires released... oh Chris," she added, as tears formed in Christine's eyes. "It was beautiful! Chris, please don't cry..."
"But what if he found out?" Chris whispered. "He knew... he looked at me, it looked like he knew! I thought... I thought he hated me..." She broke down, sobbing quietly as the tears fell.
The girls moved in and held her, dumbfounded, not knowing what to say. "No, Chris..." Taylor told her. "No... he could never hate you..."
"He came," Sherrie pointed out; they looked at him. "He came, right in your mouth. He came for you."
"That's right," Taylor agreed, catching Sherrie's point. "You made him come, Chris. He came for you, even after he fucked Ms Tiann today -- we couldn't get it out of him, but he came for YOU. If he knew it was you, and he came for you... how could he come for you and hate you at the same time?"
Chris thought about it. "I don't know," she said. "I don't know. But guys, listen: we can't talk about this after tonight, ever again. We can't tell anyone. He can't find out. No one can find out," she insisted, urgently. "If anyone found out... if he found out... I don't know what I'd do."