Nothing. She just acts.

Sophie leaned against the rough brick wall, her mouth hanging open as she pants for breath, blinking tears from her eyes as she regarded Connor with a dazed, shocked expression. Her body felt weak, used, her legs trembling as her sex pulsed, her pussy convulsing as if he was still in her.

Connor stood there, his mind racing, thoughts of what they just did... no, what he did, racing guiltily through his head, worried about what Sophie must be thinking, about how this would change everything. He'd fucked her, **** her, his own sister, Connor thought guiltily, his cock pulsing as a vulgar reminder of how he'd used her, taken her roughly, pinned against the dirty brick wall. She's going to hate me, despise me, Connor assured himself as he stood there, watching her, waiting for her to speak, the moments seeming to stretch forever as he worried that he'd destroyed his relationship with Sophie.

Sophie's eyes are drawn to her brother's still exposed, still hard, manhood as she sags against the wall. Her eyes trace over the shape of him, studying his size, judging him against her husband. He's bigger, more curved, she notes almost clinically, feeling her well used pussy spasm, insistently reminding her of how he'd felt deep inside her. She opened her mouth to say something, to say anything, but words didn't come, her voice lost as she watched a thick globlet of his seed seep out of the swollen tip, her tongue licking her lips as she suddenly found herself falling to her knees. Wincing as the rough tarmac cuts her knees, Sophie reaches out, grabbing Connor's hips, gripping him hard, pulling him to her as she devours his cock, feeling his thick cum smearing across her cheek, her lips, tasting it on her tongue.

Connor gasped, stumbling as his sister grabbed him, pulled him to her, his hand reaching out, supporting himself against the rough brick wall as Sophie swallowed his cock. Her actions shocked him, he'd never imagined Sophie acting like this as his hand dropped to her head, his fingers entwining in her brown hair, guiding her mouth up and down the length of his shaft. She's good at this, he noted, better than Louise. That taboo comparison of their fellatio skills, his sister versus his wife, sent a shiver of excitement through Connor, his cock hardening even more in Sophie's sucking mouth.

Sophie felt him tremble as she took him into her mouth, tasting him, tasting herself on his cock as she let his hand guide her head, enjoying the submissive feeling as he pulled her hair, setting the pace of the blowjob by controlling her head. Feeling his control, feeling her submission to him, sent a flood of arousal through Sophie, a new surge of heat seeping into her crotch as she let her brother use her however he pleased.

Connor heard something, turning his head towards the entrance of the alleyway, noting a couple of people glancing curiously down the narrow alley at them, a few stopping, lingering to watch. How long have they been there? What have they seen? Connor wondered, the idea of people watching, of seeing him fuck his sister, causing his cock to surge in her mouth, his hips thrusting harder against her sucking lips. "Do a good job, Sophie," Connor whispered to his sister, "you've got an audience."

Sophie froze at Connor's words, her eyes darting to the mouth of the alleyway, seeing the people pausing there, glancing at them, watching her. She was mortified, embarrassed at being caught in this taboo situation... but she also felt a thrill at being watched, at performing in front of these people. Glancing at their spectators, Sophie noticed one man, his hand rubbing at the front of his pants, obviously wishing he was in Connor's place as Sophie started sucking his cock again, her head moving up and down her brother's shaft with a renewed enthusiasm, slurping and sucking at him, putting on a good show for the watchers.

Connor chuckled as Sophie sucked noisily on his cock, obviously performing for the watching people. A few of the spectators had stepped into the mouth of the alleyway, getting out of the crush of the afternoon commute to watch this lurid show. One of the men, oblivious to the others around him, had exposed himself, was now stroking his hard cock in time with Sophie's mouth as it moved up and down her brother's shaft.

Sophie watched the man jerking off, her eyes following his hand as it moved up and down his fat shaft as her lips tightened around her brother's cock, her tongue teasing the tip as she felt Connor tense. Knowing he was about to cum, Sophie sucked harder, her fingers gripping his hips, pulling him deep into her mouth, into her throat. She heard him groan, felt the orgasm ripple through him, tasted his hot seed as it filled her mouth. She held it in her mouth, letting his seed coat her tongue as he pulled his cock from between her lips, tucking himself back into his pants. She smiled up at him, opening her mouth to let him see his seed filling her mouth as she noisily swallowed.