A/N: This one is a little dark...

She sighed, a high breathy sound and tipped her head back. His lips trailed along her throat, his teeth biting roughly and a shiver shot through her body. He rose above her, muscles straining as he drove into her again and again, and there was an edge of desperation to his movements. They never had enough time together, never could sate their need for each other, always had to part before they satisfied their urges.

He groaned helplessly against her skin, her name a benediction on his lips. She felt the tingles in her body coalesce and explode outwards, dragging her into an intense, screaming climax. She curled into the cage of his body, felt his thrusts become erratic as he too surrendered. A ragged, visceral groan tore from his chest as he shuddered, pulsing deep inside her, and, overwhelmed by the power of his release, he collapsed onto her. Aftershocks ran through their bodies and for long moments they could only lay tangled together, trying to catch their breath. It was always like this, a desperate passion that compelled them to exhaust themselves in each other's embrace.

Finally, with a contented rumble, he rolled away, pulling her against his chest and nuzzling his face into her hair. His body was already hardening, wanting to take her again and he rubbed himself agonizingly slow against her. A hungry growl sounded in his chest.

"Fuck baby, I can never get enough of you," he breathed, hips beginning to pump slowly against her. His hand trailed down to her waist, pulling her lower body closer and he groaned as he pushed inside her again with one smooth motion. He moved slowly, languidly, not because he was in anyway sated but because his lazy thrusts made her moan in the most delicious way.

"Fuck," he mumbled, rapidly losing himself in bliss, the feel of her sheathed around him threatening to steal his sanity, reduce him to a panting shell, his entire being given over to the woman who so strongly held his heart, body, mind and soul.

The shrill sound of a cell phone pierced the air. It's shriek tore through the haze of pleasure currently surrounding the lovers and she bit back a sudden gasp, recognizing the distinctive ring. He froze, still inside her, a cold wave of dread scraping down his spine. Fuck, they could never be left alone. With a strangled groan, he withdrew from between her legs and rolled away. She sat up quickly, swung her legs over the edge of the bed and reached for the phone, it lessened the guilt somewhat, when she answered right away.

"Hello?"

"Hey honey, where are you?" She felt him rise onto his knees behind her, his hand caressing her from her elbow up to the soft patch behind her ear, and as his lips brushed her skin she stood suddenly, walking away. It was too hard to concentrate when he touched her that way.

"I'm still at work." Her heart fluttered when she felt him move behind her, wrap his arms around her and pull her back against his chest. She bit back a moan as his hand traced along her breast, his breath warm on her shoulder and she was suddenly afraid that the sound of her racing heart would carry through the phone into her husband's ear. Again she shrugged out of his embrace, his hands having dropped to her hips to pull her ass back against him and moved to the other side of the room. She shot him a warning glance over her shoulder and turned her full attention back to the phone. "Where are you?"

"Just on my way back, will you be home for supper?"

She closed her eyes as a wave of guilt threatened to put her on her knees. "I'm just leaving now, I'll see you soon."

"Okay, see you in a bit."

"Bye." She ended the call and turned back to him.

"What the hell, Eric?" She growled, half-amused and half-angry.

He sauntered towards her, and her eyes couldn't stop from roaming appreciatively over his body, the way he padded like a massive cat, his muscles bunching and flexing, his cock still hard and ready. He reached for her and she let him, sighing when he pulled her against his chest again. He stroked her hair back from her face and pressed a kiss to her temple before murmuring quietly.

"When are you going to be mine, Fox? I'm tired of sharing you."

Fox groaned and pulled away. Snatching up her shirt she pulled it on then turned in a circle, searching for her jeans.

Eric held them up with a smirk and she yanked them out of his hands.

"Where's my underwear?"

His smirk widened, "you're not getting those back babe, I need something to carry me through."

"I don't have anything of yours."

He closed the distance between them in two large strides. His breath was hot on her neck. "If you divorced that asshole you could have me anytime you wanted."

Fox pushed away irritably, her endorphin high from hours of amazing sex was rapidly dissipating. "If it was that simple I would have months ago, Eric. He's the father of my son and it's not that simple."

"Why the fuck not?!" Eric snapped. "Just say it, 'Ethan, I want a divorce.'"

"And have him find out about us? 'Oh and by the way honey, I've been fucking your brother?'"

"He'll know eventually."

Fox shook her head, she couldn't deal with this right now. "I have to go, I have to get home and have a shower. I smell like you."

"Good," Eric retorted, "let him figure it out, I'm tired of hiding us."

"There is no 'us' Eric, we're just fucking."

Eric froze and Fox felt a pang at the hurt that flashed in his eyes. It was so much easier to deal with this when she told herself that, we're just fucking, it's not serious.

She swallowed. "I have to go."

"So go." His voice sounded dead.

Fox closed her eyes and turned away.

Fox emerged from the bathroom, dressed in a muscle shirt and boyshorts, her hair was damp and she finger-combed it. She stopped short when a tall figure stepped into the bedroom.

"Ethan."

'Hey doll, miss me?" He moved towards her, grinning.

Fox fixed a smile on her face. Ethan did not resemble Eric very much, he was shorter, his body naturally leaner than his younger brother's. He was an obvious Erudite transfer, in fact, Fox often wondered why he'd bothered transferring at all. If it wasn't for contacts, he'd even wear the stereotypical black-framed glasses. He was scary smart, skilled with computers, and was constantly being shuttled back and forth between factions to help set up new computer programs and solve technical problems. Eric and Fox wouldn't have the time they did have together if not for his nomadic career.

"Where's the little guy?"

"He was tired, I laid him down for another nap."

Ethan nodded absently. He moved closer and Fox fought the impulse to step back. His touch felt cold and abrupt compared to his brother's. He looked into her eyes a moment before leaning forward to kiss her. His eyes stayed open, something that never failed to bother Fox and pressed his lips to hers. His kiss felt foreign, unwelcome but Fox forced herself to respond. His hands began to roam and Fox fought a shiver of revulsion. It hadn't always been like this, but as her affair with Eric had continued, her body had began to strongly prefer one brother over the other. Fox was tender, sore between her legs and knew she wouldn't be able to convincingly feign pleasure, not tonight; she and Eric had been wild, separated for too long.

"Ethan, not now. I'm not in the mood, honey, I've got to check on supper." Fox pushed him gently away and he gave a small petulant grunt. She started to leave the bedroom when he spoke again.

"You never are anymore, what's your problem?"

"Nothing, just tired. Remy's been a handful lately."

"Are you sure?"

Alarm bells began to ring in Fox's head, there was an edge to Ethan's voice. He stalked towards her and Fox forced herself to stand still. His eyes roamed over her and Fox held her breath.

"Where'd this come from?" His tone was conversational, but his eyes burned. His fingers brushed Fox's throat and her heart skipped. Had Eric left a mark when he'd bitten her?

Feigning ignorance, Fox turned to inspect her neck in the mirror, faint bruises coloured her skin, right over her pulse point, right where Eric had bitten her as his first orgasm had torn through him. Shit.

"Remy was a little crazy, we were having a tickle fight and he bit me."

Ethan raised his eyebrows, then nodded. Fox exhaled and turned to leave. Suddenly, Ethan grabbed Fox's upper arms and slammed her into the bedroom wall.

"Bullshit honey." Ethan's tone was low and monotone.

Fox's heart began to thump with dread. She'd only learned after her wedding that the elder Coulter brother had a violent streak, that while Eric was more demonstrably moody, more upfront with his tempers, Ethan was a slow burner, holding in his rage until it exploded. Fox had been unfortunately raised under a father with the same fuse, and she'd dutifully overlooked Ethan's first few rages, taken them as a matter of course, as her lot in life. Only time in Dauntless and exposure to Eric had helped her to realize she didn't need to tolerate this. Regrettably however, by the time she'd come to this conclusion, she was already bound to Ethan by the child growing large in her belly.

Ethan had been good for a long time, but that had apparently come to an end.

His hand reached up and leisurely stroked her jaw line. "I don't think that Remy did that, and I'm right now, aren't I?"

Fox swallowed, opened her mouth to voice a denial again when Ethan's fuse finally flared. Her head bounced off the wall again.

"I think you're going around behind my back, aren't you, sweeting?"

"Ethan, I-"

Remy, blessedly, chose that moment to announce his return to wakefulness with a loud wail. Ethan torpidly turned his head in the direction of their son's room. Looking back at Fox he leaned in close, his hands tightening painfully.

"I hope I'm wrong, honey. I really do, because if I find out that you're fucking someone else, I will make sure you never see Remy again... understand?"

Fox's blood ran cold, he wouldn't... "Ethan, you wouldn't-" Her teeth clacked together as her head bounced a third time.

"Don't tempt me, sweeting. I have friends in Candor, friends who mediate the divorce courts, and you'd be the guilty adulterer." He glared silently at her a long moment before speaking again in a low tone, and the words he spoke sent a spike of terror through Fox's heart. "Ah, you're assuming I'd just keep you from seeing Remy. Oh, no darling... If I find out you've been cheating on me, I'll kill the boy."