Prompt from Somebody That Cares. Iris finds out because he does/knows something that only Barry does/knows, but waits to see if he will tell her. While she waits she realizes her feelings for him.

"Hey, Flash." Iris said as she felt a slight breeze and was suddenly on the roof.

"Hi." Barry couldn't help but smile at his best friend.

They stood in comfortable silence for a few minutes, each soaking up the other's presence like this was their last chance to be together.

"Tell me a story." Iris said suddenly.

"What?"

"Tell me a story." The Flash laughed at her request. "I'm serious. Tell me something about your past."

"Iris, we've been over this. I can't-"

"Then make one up, but tell me something." Iris pleaded.

"I've never been very good at stories." Iris stared at him expectantly. "Once upon a time-"

Iris laughed. "Once upon a time?"

"Yeah, what's wrong with that? It's a normal beginning to a made up story."

"Nothing. Nothing's wrong with it." She said trying to suppress laughter.

"Do you want a story or not." The Flash gave a mock offended laugh and gestured for her to sit beside him.

She nodded in response and sat down next to him.

"Once upon a time there was a boy who had exactly one friend. She was all he needed. They were polar opposites, she was popular, he was a nerd, she was sensible, he was crazy, but they worked. Neither one of them cared that they were different. They were there for each other at a moment's notice. As they grew up hard times hit. The girl lost her mother at the age of three (?), the boy lost his parents at the age of eleven."

"C'mon at least give them names."

"Okay, we'll call them Ann and Henry." Iris looked down at the Flash's hand. He was tapping his fingers in the same pattern Barry always did; first finger, third finger, second finger, fourth finger, first finger, third finger, second finger, fourth finger, on and on. Iris shook herself and turned her attention back to the story. "Henry began to fall in love with Ann, but she didn't notice. He was too afraid of ruining their relationship that he never told her." There was emotion in the Flash's voice that Iris hadn't heard from him before. It was a mixture of hurt, resignation, and sadness. "Ann still came to him with everything, cried on his shoulder when boys broke her heart, and Henry just comforted her the best he could. He grew to love how much she trusted him, but he also came to except that sometimes the impossible really was impossible."

"That was a depressing story, but it felt more real than you do."

"More real than I am?" The Flash gave her a confused look.

"You run faster than sound, you're a hero, you're the humblest person I know, besides Barry, and you singled me out. Any girl would be amazed by and open to a superhero giving them regular visits and help with their chores. Some days it feel like I'm going to wake up, and I'll have been the one in the coma, not Barry, and this has all been some coma hallucination-"

"Iris, I'm real. I'm here. I'm alive." The Flash gently took her hand and placed it over his heart, just like Barry had done a few months earlier. "My heart is beating." His heart was beating fast.

Barry, she thought, this is why I'm so comfortable around this powerful stranger. He's not a stranger.

If Barry noticed the change in her mood, he didn't let on.

By the time they left the rooftop that night she had plenty of time to think about the story he had told. Barry had basically just confessed his love for her in a round-a-bout way, but maybe he was making things up and mixing it with the truth. Iris didn't know, she didn't even know which explanation she preferred. There was a chance her best friend was in love with her, and she didn't know how to feel. There was a time when they were younger, when she thought that he would be the man she would marry. Barry had been her only guy friend, and she had always thought he was cute, even if he was the nerdiest person she knew.

But, did that mean anything? Did she love him now? It was all so confusing. Iris's heart had never had to make a choice before. She had always had Barry and hadn't needed anything else until he was in a coma and Detective Pretty Boy had helped to ease the pain of the situation. There hadn't been a time where she had had to make a choice.

Two weeks later she had realized she couldn't keep leading Eddie on. The more Iris thought about her feeling, and her relationship with Barry, the happier she felt. If that happiness at the thought of another person wasn't love, than Iris didn't even know where to begin find what love was.

Eddie had felt Iris grow more and more distant, and he thought he knew why. He had suspected Barry's feelings for Iris the first time he had seen the two friends talking, but he had genuinely thought Iris cared for him the way he cared for her. Eddie knew when things needed to end so he had broken things off with Iris. It had been awkward and t broke both their hearts- Eddie's more so that Iris's- but both knew it was right.

He couldn't change her heart, it had been claimed far too long ago.

Iris was a little frustrated. It had been over a month since she had figured out he was the Flash, and he still hadn't told her he was. She was his best friend, how could he not tell her about something this huge? But, Iris had finally made a decision.

"Barry, do you want to go out Friday?" Iris asked feeling kind of awkward.

"Sure, what do you want to do?" Barry misunderstood what she was asking.

"Movie, dinner, maybe go for a walk?" She was still feeling awkward, and she was starting to realize how Barry felt when she was completely oblivious to him.

"Sounds great."

"You do realize I'm asking you on a date right?" Iris raised her eyebrows at her best friend as he took a swig of coffee.

He choked on the hot liquid and coughed for a minute. "What?" Barry asked with a smile growing on his face.

"A date, with me. Do you want to?"

"Yes." Complete happiness would not be close to describing how Barry felt at this moment, but he remembered something, and his smile fell. "But, I have to tell you something first."

Iris smiled, was he finally going to tell her the truth?

Barry waited for her to get off work and then they went to a large clearing. It was the clearing where STAR Labs had first tested his speed.

Barry glanced back at his best friend and sped off. Iris watched him run around, red electricity trailing behind him, in amazement but not surprise. After a few minutes he stopped behind her.

"I get called away to take care of things pretty often, I didn't want you to think I was blowing you off if I got called away during our date, but I need you to understand, this is dangerous. You've been kidnapped just for writing a blog about me. No one can even suspect that you know who I am. I can't let you get hurt."

Iris just smiled at her best friend. "I did a good job at letting you know that I knew."

"What?!" Barry exclaimed.

"I've known you my whole life Barry. I'm surprised it too me as long as it did. When you were telling me that story on the rooftop, I noticed things. All the small nervous ticks you have and all the things you don't realize that you do, the Flash did them too. No two people are that alike, it had to be you." Iris looked him in the eye the whole time he was speaking. Her gaze held him captive like he had always been too afraid to allow it to.

"So, is the date still on then?" Barry asked goofily.

"Of course." Iris answered wrapping herself in his arms. "I've been looking forward to this for a long time, we both have." The walked away from the clearing hand in hand.