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AN:

Thank you for the great reviews! And for those who mentioned it, I did not realise quite how my use of 'let go' as an emotional phrasing was similar to a certain ice-based song until it was pointed out to me. I don't know how I manged to blank on that one. Hope you enjoyed the additional humour it brought even though it was unintentional! ;p

Also thank you for your patience in waiting for this chapter; I had a small accident at work and have only just managed to adjust to the painkillers so I can actually think and not just be woozy.

I hope you enjoy this next instalment and if you could spare a moment to let me know what you think that would be awesome.

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Barry grinned down at her. "So it felt good?"

"Mm-hmm," she smiled shyly up at him but then her eyes caught on something and her hand suddenly shot up into his hair. "Oh my god, I put icicles in your hair!"

"I'm fine Cait," he said.

"I could have hurt you! I can make really big icicles you know and if one of them had gone into your head that would have been a blunt force injury. I could have easily shattered your skull or caused a hyperther-"

"Caitlin stop," Barry said sternly, gripped her hands in his on either side of her head. "You didn't do any of that. In fact I'd say you barely used your powers at all."

"I can see the ice Barry."

"Yeah, some ice. You don't see the whole room covered in it do you?"

Caitlin lifted her head and quickly looked around the room, then turned back to Barry and shook her head as she bit her lip. Barry just knew she was trying to hold back a smile at the fact that that room wasn't covered in ice.

"So looks like, although you felt everything and it was good," Barry couldn't quite keep the smug tone out of his voice. "You didn't lose control. You're fine, I'm fine, and the room is fine. All those feelings and you didn't cause anything bad to happen. Pretty good for our first go at this huh?"

"Hmm," Caitlin replied and shifted on the couch underneath him, causing Barry to take in a sharp breath. "I think maybe we should be more thorough before we make a statement like that."

Barry tried very hard to hold back his grin but he felt it stretching across his face; here was the playful Caitlin from their emails. "More thorough how?"

"Well, I've experienced the change in stimulus we proposed and it evidenced a positive correlation between my powers and my emotional responses, therefore proposing a positive result for our aim of today's part of the experiment. But you haven't yet experienced the change in stimuli and therefore testing the correlation between your control and your use of powers," Caitlin said, and then she moved again, shifting her hips up against Barry's, moving her core against his hard erection.

"M-maybe just one of us testing is enough," Barry choked out, grabbing her hips to stop her moving. "What you went through was pretty intense and I know you were worried about it beforehand and I don't want you to think there's any pressure whatsoever for you to-"

Hands slid through his hair and down to his chest cutting off Barry's words.

"Barry," Caitlin said softly. "Do you trust me?"

"Yes."

"Then let me do this for you," she said. "And for me. I want to experience everything with you so I can keep my control and that means being there for you as well as you being there for me. Being together, in every way, is the only way I'm going to get control back and get some possibility of a future with someone."

"You're going to have a future with someone," Barry said. "You're too amazing not to have that."

Caitlin smiled softly, a real smile and Barry felt that that more than anything else he'd done for her in the last hour, was amazing.

But while he was caught up looking at her face, her hands were moving.

Barry shivered as static trails caressed the skin of his shoulders and back, fingers digging in to muscles as he flexed above her. Caitlin arched herself further back into the sofa, causing her whole body to move against Barry, her chest grazing his and her hips cradling his erection. He grasped her hips tightly in his hands but the movement just brought her harder against him.

"Let me make you come Barry," Caitlin whispered, using his words from earlier against him. "Let me make you feel this time."

Hands threaded through his hair and tugged him down as her lips captured his. Barry groaned helplessly against her mouth as she moved her body underneath his in time to the strokes in his hair, her nails grazing his scalp as her skin rubbed against his body. He gripped her hips harder but was under no illusion that his hands were doing anything other than reacting to her body.

Caitlin lifted her legs and wrapped them around his waist, pushing her feet into him, encouraging him to move with her, to grind their bodies together. Not that he needed much encouragement.

Barry released a hand form her hips, cradling her jaw in his hand as he changed the angle of their kiss, probing deeper as their tongues danced together. Puffs of cold air glanced along his throat as Caitlin gasped in breaths against his mouth but the shock of the cold only heightened his senses, made the touches so much more electric and pronounced.

Caitlin's hands were running all over him, over his shoulders, down his back, ghosting over his backside before sweeping back up into his hair and he couldn't get enough of it.

"Barry," she whispered against his mouth. "You can move, if you need to."

"I'm not going anywhere," he panted into her neck as he kissed along her smooth skin, heading down to her shoulder and then down into the valley between her breasts.

"No, I me- oh, ohhh, I meant you can move."

Considering Barry liked to think of himself as the fastest man alive it took him quite a while to catch on to what she meant.

But Caitlin had no problem helping him and went about showing him.

Flexing those fantastic legs of hers Caitlin managed to flip them so she was on top with Barry lying on the couch underneath her. Running her hands down his chest as she slowly rotated her hips against his Barry felt the static charge over his skin and spark against her. Small currents fizzled between them where his lightning had ignited out, dancing along her skin before it met the glimmering power of her ice.

Caitlin slowly moved her hand down in-between them and under his boxer shorts, wrapping her hands around his hard length. Barry groaned as her cold hand pumped up and down on him steadily.

"Barry," Caitlin leaned forward, brushing her breasts against his chest and nipping her teeth against his bottom lip. "Does that feel good?"

All he could do was groan in response.

"I know what could make it feel better."

Barry opened up dazed eyes to stare up at Caitlin, watching her move above him as he felt her hand move against him.

"Speed Barry. Wouldn't moving faster make it better for you?"

"Cait," he gasped.

She kissed him again as she tightened her hand and twisted. Barry's hips seized up into her as pleasure rocketed through him and he couldn't stop what happened next as the need raced through his veins as the blood pumping through his body in one direction carried the promise of ecstasy. Lightning fired his synapses and he began to move, vibrating against her as his body sought to chase the high that was so close.

Caitlin's hand was wrapped around him tight and with the friction of his vibrations moving against her Barry felt his climax building and building. He grabbed her, clashing their mouths together in a desperate kiss as she twisted her hand again and provided the final catalyst for his culmination.

Caitlin moved with him through it, gentling her pumps as his body slowed and then finally relaxed. His harsh breathing echoed around the room as he fought to get oxygen back into his lungs and she moved to slip off him but Barry wrapped his arms around her and pulled her closer to him, not wanting her to go.

What they'd both been through had been so intense and so intimate and all he wanted to do was keep her close while he could. Caitlin seemed to agree as she snuggled down against him, settling her head on his shoulder and gently running her hands up and down his chest. Barry kept his arms wrapped around her tight but let his fingers play, one hand tracing patterns against her skin and the other combing through her hair.

"That was amazing Cait," he said softly after a few minutes. "I haven't been with anyone since my powers activated. I always thought I'd hurt them, with the lightning and the friction."

"And why you joined the programme."

"Yeah."

"I haven't been able to touch anyone in over a year," she said quietly. "But it's been longer than that for intimacy."

Barry tugged her closer, wanting her to know he was here, not hurt and not going anywhere, though he didn't know how to put that in words quite yet. He knew they needed to talk about things, especially about their powers and their intimacies but he didn't want to ruin the moment, didn't want to put pressure on when they were both relaxed and just with each other.

The buzzer trilled through the room and Barry jerked up, not expecting it at all.

"Guess that's our time up," Caitlin said softly.

"Guess so," Barry answered smiling at her. He didn't want to descend into awkwardness but he couldn't think of anything else more to say. There were a million things he wanted to say - about what had happened between them, about what would happen next time, about whether she was really ok, about what this all really meant – but he couldn't think how to put them into words and he did not want to babble his way through this conversation.

Caitlin reached up and squeezed his shoulder, a comforting gesture before she extricated herself from him and started putting on her clothes. Barry moved as well, slowly getting his own clothes back on.

"We'll speak soon," Caitlin said.

"We will?" Barry asked.

"Of course," she answered, her lip firmly pressed down in suppression. "I mean I'll have to send you an evaluation form, score your results for today's experiment."

For a split second horror raced through Barry quicker than his lightning. Then Caitlin's barely suppressed smile and twinkling eyes managed to register in Barry's brain.

"Very funny Cait, but turnabout is fair play. I can score you too."

A second buzzer, this one slightly louder and longer than the first, sounded through the room.

"I think they might want us to leave," Barry said deadpan.

Caitlin burst out laughing and threw her arms around Barry in a tight hug. "Thank you," she whispered. Then she grabbed her bag and went through her door, disappearing on him.

Barry could not get the grin off his face and wondered why he should even try to as he left their room. Last time he'd done this walk he'd been confused and upset, not knowing what he could do but now, now he felt like he could take on the world. No matter what came his way he'd be able to deal with it. He felt the most relaxed and comfortable in his own skin as he'd ever been and he knew that was down to Caitlin and what they had experienced together.

He'd taken on the project for reasons that seemed so important at the time, for a person that had been the most important person to him at the time, but now all he could think about was Caitlin.

His message alert pinged on his phone and Barry reached for it as he walked down the Star Institute corridor, quickly mumbling an apology as he collided with guy in a Star Wars t-shirt. An email was waiting for him on the Star email server and Barry's grin grew even bigger. Guess 'speak soon' really meant soon and Barry had no problem with that.

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