Summary: Cloud and Tifa want a baby. But after all his dips in the Lifestream, Cloud has been rendered infertile. To gain the child they both want so badly, Cloud tells Tifa to go have sex with as many men as possible until she gets pregnant. But when she does, who's the father? And what are the men's reactions when they discover that one of them is the father of Tifa's baby? AU. Smutfic, once the plot's out of the way.

Disclaimer: All I own is the Penthouse where I got this idea, and the idea itself. Nothing else belongs to me.

Queen's Quornor: And in this chapter we get not one, but TWO lemons! I have been working on this one for a while now, hope you all find it satisfactory! And the bit with the motorcycle is actually possible; catching your neighbors in their driveway in the dead of night can be highly educational! And yes, a Gamestation is the Gaian equivalent of a Playstation. Remember the chapter from "Evidence of Sephiroth's Humanity?" Zack's a gamer, even in this AU! This chapter is meant to be sad; I'm sure that everyone has wondered what might have happened if they had chosen someone other than who they are with now. And I had to throw a bone to the other most-loved Cloud pairing, so don't shoot me!

Betrayal and Love

"Tifa! Ready to go?"

"Just a minute!" Tifa pulled up her jeans and tied on a t-shirt she had 'modified' years ago. The sleeves and back had been cut off completely, leaving only the front and sides. How did the black and silver garment stay on? She had left long, thin streamers of the original fabric to tie it snugly in place around her back. Cloud loved that shirt because it was so easy to get it off her.

The boots from the previous night, some black leather wrist cuffs with silver studs she had stolen from Cloud, and her worn black leather jacket completed the ensemble. A wide headband tied beneath her bangs, and she was ready. Even she had to admit, she looked good.

"I'm coming!" she called out, proceeding down the stairs.

"Already? I haven't even done anything yet!"

Tifa rolled her eyes and came around the corner into the bar. "Zack, you're..." Her voice trailed off when she saw him. Sleeveless black vest open in the front, exposing his tightly-muscled chest, ripped jeans and boots, leather gloves, riding goggles shoved up into his hair...

Words failed her.

Zack grinned and leaned back against the wall, crossing his arms across his chest. "Like what you see, Teef?"

"I'd be a liar if I said I didn't. But can you blame me? You could make a lesbian go straight!" The martial artist grabbed the housekeys off the bar as she passed it.

"You don't look so bad yourself, babe." Zack opened the front door and let Tifa go first, going to his bike while she locked up.

If you wanted an accurate comparison of Cloud and Zack's different personalities, you could find nothing better than their bikes. While Fenrir was big and black, built as much for distance as for speed, Hrist was a much flashier machine. It was painted an extremely deep, dark purple with silver flames rippling along the gas tank, the chrome polished to a mirrorlike shine rather than painted black like Fenrir's; built purely for speed, it was a smaller, far sleeker motorcycle than Cloud's could ever hope to be. But for all it's size and flash, it still made a powerful noise when it was turned on. Hrist could go 0 to 120 in under five seconds, the truest approximation of a crotch-rocket Tifa had ever seen.

She loved riding Hrist. With his reflexes, Zack always toed the line between safety and total disaster whenever he rode it, weaving around other motorists and taking curves at the last possible second and generally giving passerby near-heart attacks. It was a total adrenaline rush; what girl wouldn't love it?

Sliding on behind him, she linked her arms about his waist and pressed close to him; Zack loved a good tease. In response, he flipped on the ignition and grinned at her over his shoulder as Hrist came to life. Tifa blinked and buried her face against his back. In her heightened state of arousal and anticipation, the motorcycle was just a wee bit...thrummier than usual. Almost like a giant-sized vibrator...

A flick of his wrists, and Hrist took off, zooming through the streets at breakneck speed, a blur kept safe under Zack's practiced guidance. Tifa held tight to his vest, shifting on the seat as the vibrations were seemingly focused more directly on her sensative core. It was naughty, it was unusual, but she liked it.

A lot.

By the time they were at the race course in the desert, Tifa was already limp. Hrist's vibrations had brought her to orgasm twice already, and her jeams were soaked with her fluids. Zack shook his head when he got off the bike and had a good look at her. "Jeez, Teef. Impatient, aren't you?"

She flashed him a lopsided, playful grin.

"Stay there. I'm gonna go register." The black-haired man ran off, leaving the martial artist by herself, well away from the main action.

Sitting on Hrist's seat, Tifa restlessly rubbed her thighs together, hungry for more. Nobody's around, so...

Like most of the big racers and stuntmen, Zack had parked in a secluded area, far from the crowds. Less chance of unexpected tampering from rivals if nobody could find your ride, after all. So she was perfectly alone, with little chance of anyone walking in on her.

Aw hell. Why not?

Tifa quickly unzipped her jeans and wriggled out of them, draping the garment over Hrist's handlebars before propping one leg up on the seat and laying back against the metal backrest. Spreading her legs and sucking on her fingers to get them wet, she began stroking her soft, open folds, avoiding her clit for the moment.

As she played with herself, she thought about the threesome she and Cloud had had with Zack only a few nights ago, letting the memories drive her ever higher. Feeling herself growing slicker, Tifa pushed her fingers into herself, moaning at the sensation and reached up under her shirt to pinch and pull at her nipples. Three fingers now, pumping steadily in and out of her opening while her thumb rubbed her swollen clit. Feeling her passion rising, Tifa let her head fall back on a moan. "Zaaaaack..."

"You called?"

She whipped her head to the side and saw the black-haired man standing not three feet away, his pants already unzipped and his hand eagerly fisting his erect cock.

"You could have told me you were there," she groaned, not stopping just because he was watching.

"And miss this show? Hell no." He rubbed his thumb across the tip, spreading his precum acround the head. Zack, unlike Cloud and Reno but like Sephiroth, was circumcised. "Unless I can join in, that is..."

"Ride me on Hrist," she said, pulling her fingers out of her hold. "Treat your lady like you treat your bike, remember?"

"Does that mean you want me to adjust your torque or clean your pipes?" Zack asked cheekily, letting his cock lead him over to Tifa.

"Ha ha. Very funny." Tifa got up and grabbed his hips, slamming him down on the seat against the backrest and prepairng to climb on. But before she could, Zack stopped her.

"Haven't you ever had sex on a motorcycle before, Teef? You don't get off until the bike's on!"

She blinked at him. "Huh?"

Zack leaned forward and hit the ignition, fixing it so the bike would continue running while remaining in one place. Once he settled back down, he motioned for Tifa to take her place atop him.

She felt the difference the moment she touched him. Hrist's vibrations travelled up through Zack's body, turning him into a sort of living vibrator. Her arousal spiked immediately, and suddenly she needed to fuck. Not make love, not have sex. Just fuck.

Positioning herself, Tifa just dropped down onto him, engulfing his big, thick cock in one swift movement. Zack gasped sharply and his hands flew to her hips, holding her in place. "Don't move!" he hissed, screwing his eyes shut.

Tifa found the sensations equally immobilizing. It was extremely intense, better than any sex toy she had ever had. Experimentally, she rocked her hips forward, bracing her hands against the ex-SOLDIER's shoulders.

"Teef! I said don't move!" His eyes were squeezed tightly shut, and he clamped his hands down on her hips to prevent her from grinding again. "It's been awhile since I've done this, ok? Just gimme a moment."

"How long?" she asked breathlessly.

He looked up at her. "The last woman I did on a bike was Aerith. Does that answer your question?"

It did. The half-Cetra had been killed by Palmer during the final attack on the Shinra building, three years ago. Zack had been going out with Aerith back then; suddenly Tifa understood why her friend had loved Zack's first bike, Sleipnir, so much.

"Yeah. Just tell me when I move, ok?" Tifa wasn't sure she could stop herself from moving at all, but she was willing to try, so this wouldn't be over too fast.

After a long moment of just sitting there, letting the vibrations stimulate them, Zack sighed shakily.

"Go ahead, Teef."

The martial artist nodded and straightened her legs, lifting herself halfway off him, before sliding back down quickly. They both moaned at the feeling, and with Zack's help Tifa was soon bouncing up and down on his lap, her clit rubbing against his belly with each stroke. Hrist's vibrations increaed her pleasure and his, and soon she was crying out in an orgasm even stronger than she had dreamed.

As she was calming down, Zack cut off Hrist's engine and, supporting in his arms while carrying her on his cock, he got off the bike and tossed her jacket and his vest down for a bed. Laying the nearly-comatose Tifa on the satin lining, he carefully arranged her on her knees so her hips were high in the air.

Tifa snapped out of her post-climactic stupor the moment Zack grabbed her hips and sunk back inside her hard, from behind.

Now it was all about him, and Tifa could only hold on as he rammed into her as fast as he could, with all his mako-enhanced strength behind every thrust. It felt good, but wasn't enough, and soon she was sobbing from sheer sexual frustration, from her inability to attain release.

Zack heard her tears and stopped, lifted her hips slightly, and plunged back into her; the martial artist nearly screamed as his cockhead rammed into her G-spot.

And continued to grind into it, as he abandoned thrusting in order to commence twisting his hips, corkscrewing into her and out again, while one hand reached down to play with her clit while the other palmed her left breast.

"Oh god ZACK!!!" Tifa howled, her back arching into a deep curve, jerking as if electrocuted as her climax consumned her. Her sheath tightened so much around Zack's cock that he couldn't move, and the sheer pressure of her rippling contractions milked him of his seed, drawing it deep into her womb.

Zack collapsed atop her, his weight forcing her to lie flat on her stomach. Panting, they tried desperately to catch their breath. "Great Shiva, Teef... That was fucking amazing..."

"Yeah. Fantastic," she gasped. "I never would have dreamed that motorcycles could feel that good."

"Lemme guess: you'll be riding Fenrir with Cloud a lot more often, right?" Zack pulled out of her and reached for his clothing.

"Hell yeah!" Tifa snagged her jeans and pulled them over, rolling onto her back so she could get them on. "Maybe even steal it myself, if the mood strikes me."

Zack chuckled. "Somehow, I don't think Cloud's gonna be too mad about his wife becoming a motorcycle-nympho. He never had any complaints about Aerith, after all."

She froze. "What?"

The ex-SOLDIER glanced at her. "Didn't he tell you? He took Aerith out on his first bike a few times, and I know for a fact that they had sex on it. I was there." He chuckled. "Hell, one time we even had a threesome back-and-forth on our bikes. Parked 'em right next to each other and kept 'em running, and she kept going from one to the other, without stopping. One of the best nights of my life, I have to admit." Zack looked towards the race-track, where the blare of a bullhorn could be heard. "Well, I'm on soon. Let's go, Teef."

"Sure..." Tifa got on Hrist behind Zack and slid off when they got to the dirt ramps, letting him go and begin his demo to the cheer of the crowd.

Cloud had cheated on her with Aerith. And he had never told her, his then-girlfriend/now-wife, about the affair. Zack obviously thought he had, or he wouldn't have said anything.

The thought hurt, because the spike-haired swordsman had sworn to remain faithful to her before Zack introduced them to Aerith. He had willingly betrayed her, and he had not even confessed it to her!

Was letting her go out and have sex with other men a way of assuaging his guilt over his long-ago betrayal?

She mulled over the issue the entire time Zack was on the ramps, not paying any attention to her friend's death-defying stunts or the amazed cheers of the gathered teenagers and young people. She didn't even realize his demo was over until Zack rode over to her and touched her arm.

"You ok, Teef?" he asked, purple eyes concerned.

"Get me out of here, Zack," she whispered. "I just want to go."

"Ok. I'll take you home."

"No!" She couldn't face her husband right now. She didn't want to confront him about his betrayal, and she knew she would if she saw him now. She just knew she wouldn't be able to keep the knowledge to herself. "I want to stay at your place tonight."

Zack arched a brow quizzically. "Are you sure? I mean, Cloud's gonna wonder..."

She cut him off with a finger to his lips. "Cloud has this fantasy about me coming home full of another man's seed, of fucking me after another man has had me. I'm doing this for him," she lied, giving him the same half-truth she had told Sephiroth the other day.

Would Zack fall for it?

The ex-SOLDIER shook his head slowly. "Spike's always had some weird turn-ons. All right, Teef. you can stay in my bed tonight."

"Thank you, Zack."

During the ride to Zack's place, she thought back to her times with AVALANCHE after Aerith had joined, reviewed every interaction she had ever had with the flower girl. There had never been any indication of infidelity from either her or Cloud. Aerith had been no different from Jesse in how she acted towards Tifa, apart from her kind sensativity. There had never been any clue from either of them that they were sleeping together. Not a single one.

I guess ignorance really is bliss, she thought miserably, feeling her heart twinge at the thought.

TZTZTZTZTZTZTZTZTZTZTZTZTZTZTZTZTZTZTZTZTZTZTZTZ

"Well, this is it." Zack unlocked the door to his apartment and pushed it open. "It's not much, but it's home."

Tifa entered the apartment and looked around. She had never been to Zack's place before, and its rather thrown-together appearance surprised her. The decor appeared to be a mix between expensive electronics, swords thrown wherever and anywhere, and second-hand furniture, all combined with basic bachelor mess. Not what she might have expected of Zack, who she knew favored art-deco furnishings.

"Can't afford much on my salary," he commented. "Most of my gil goes into my Gamestation and my swords, if not Hrist."

"You don't have to explain. Just show me the bedroom."

"Down the hall, last door you come to," he instructed, turning to lock the door. Tifa followed the directions, and soon stood in the bedroom, looking around. There was a chest of paint-splashed drawers and a closet, but not much else in the way of furniture. The walls and ceilings were covered with posters of naked women, some alone, some with other women, but most with naked men. Zack's bed was nothing but a mattress covered with blankets and pillows, lying in the middle of the floor. There was a plastic drinking glass beside it, with an inch of water in the bottom, and a pile of magazines with a crumb-covered plate atop them. Zack was apparently not the best housekeeper in the world.

She had to grin. Single men were utterly predictable.

By the time Zack joined her in the bedroom, she was already naked and under the blankets.

"You're sure you want this," he stated, crossing his arms over his chest.

Tifa nodded. "Just make love to me, Zack. Please."

I need to know that somebody cherishes me tonight.

His glowing eyes searched her face, and then he began to strip, flinging his clothes into a basket against the far wall and kicking off his boots before sliding under the blanket, already reaching for her.

Tifa willingly went into his arms and pressed tightly against his body as she accepted his kiss. This kiss was different from all the others she had had lately, however; it was full of tightly-leashed passion, of deep emotion, slow and gentle. Exactly as Cloud had once kissed her, when he still treated her like a treasure than his wife, but strangely more loving than anything she had experienced from her husband in a long time.

She didn't have time to dwell on the possible implications because Zack was already easing her onto her back, his hands beginning a careful, thorough exploration of her body. His fingers lightly traced her breasts, caressed the stiff little nipples, and trailed down her belly, leaving nothing but longing desire in their path. Tifa looped her arms around his neck and buried her fingers in his soft hair, slanting her mouth against his so his tongue could better stroke hers.

She needed this. She needed to know that somebody cared...

Zack's large hand cupped her mound, the first two fingers already slipping into her slit. Tifa's hips arched upwards slightly, and she reached for his erection, wanting to give him the same pleasure he was giving her. But Zack swung his hips out of range, pulling his mouth away from hers to shake his head.

"No, Tifa. Tonight's for you."

He had already begun feasting on her breasts before she realized what he had called her. Zack never called her anything but 'Teef.'

Then his talented mouth and fingers went to work, and reason flew from her grasp.

His tongue carefully bathed her nipples, making them stand as erect as they had ever been before latching onto the left one, suckling her hotly. His fingers slid along her slick tissues, delving into her and gently rubbing the tip of her burgeoning jewel. The sensations were exquisite; Tifa's body slowly writhed and undulated, her fingers kneading both the sheets and Zack's hair as her passion grew.

Then his mouth was between her legs, his hot tongue lapping at her entrance and sliding along her folds, scraping gently at her glistening jewel with his teeth. Tifa cried out and spread her legs wider, urging him onwards with breathless groans and small, breathy cries. Zack obliged, feasting on the copious nectar of her body before sucking gently on her pearl.

The martial artist exploded, her body overtaken by sweet heat and powerful shudders. Zack sat back on his haunches and watched her come undone, his eyes alight with a powerful emotion that Tifa was too preoccupied to see. By the time her orgasm released her, he had already replaced his mask.

Zack settled himself atop her and claimed her lips again for a heated kiss. All too soon, he pulled away and looked into her crimson eyes, tenderly brushing some hair away from her face with the backs of his fingers. Tifa leaned into the touch, and he tipped her head back to where he could watch her eyes.

Their gazes locked, he gently pushed into her once more, slowly. Almost as if he feared she would break if he entered her too quickly. Tifa gasped at the feeling, but found herself unable to take her eyes off his. The emotion was back, something she had only ever seen in her husband's eyes.

Love.

And then he was moving, so carefully. His arms curled under her back to hook onto her shoulders, pulling her securely against him. She held him in turn, submissive and quiet beneath his body, still watching his eyes. The rhythm remained measured and slow, so unlike the man she had lain with twice before. The pace of a love, rather than a lover. Slow fire building slowly in their veins, spilling into their nerves, higher up their spines with every careful thrust and withdraw, every gentle press and deep grind.

Completely opposite of what she had come to expect from the ex-SOLDIER, full of love and passion rather than pure lust and need. This was him showing her how he felt about her...

...and it was enough to make her tremble.

In the end, this slow love-making caused her to gasp and throw her head back against the pillows, her hips bucking up to meet his as he entered her once more. His quiet groan, the lids sliding over his eyes, was the only sign she received that spoke of his release.

Boneless from the quiet intensity of her release, Tifa did not resist when he rolled onto his back, taking her with him and tucking her along his side, her head pillowed on his shoulder and upper chest. She felt his lips press against the top of her head in an exhausted kiss, and only just heard his whispered confession, no louder than an exhalation of breath.

"I love you, Tifa. If Cloud hadn't gotten you first, you would have been mine."

Long after Zack had fallen asleep, Tifa lay curled against him, lost in her thoughts of her husband's long-ago betrayal...

And musings upon what might have been.