Prompt from Mayflowers123. The Flash is talking to Iris (vibrating his vocal cords) and Iris gets close enough to him to take off his mask.
"You called?" The Flash set Iris on her feet on what had quickly become his favorite rooftop in the city.
"Yeah, I think I found some questions you can actually answer, truthfully, Ralph." Iris's eyes gleamed in that special look that Barry could never say no to. (There were pictures of him dressed as a very tall elf complete with curly toed shoes to prove it.)
"You can ask. I can't guarantee I'll answer, but you can always ask."
Her distracting smile widened. "Favorite part of running?"
"It makes me . . . capable of saving people. I can't describe the feeling I get when someone's life is a little easier or longer because of something I did. I can help people before anyone else would know what was happening, much less respond to the need. Running gives me purpose."
"You could have been an unstoppable criminal, and your life could have been much easier, why do what you do?"
"I had an interesting childhood. My parents and the family that took me in . . ." Barry was getting too close recognizable details. "The thought never even crossed my mind that I could get away with it. I'm not sure I would be able to handle a life of crime."
Barry had stopped circling the rooftop and was now slowly walking toward Iris as she asked her questions.
"Another family took you in? Why?" Barry backed up a few paces. "Sorry. Why do you talk to me?"
"You care, your blog put you in danger, and I wanted to protect you from the people who would want to hurt you to get to me, also I don't have a lot of friends, but you seem to like outcasts."
"I wouldn't call you an outcast, I don't really know anyone that I would." Barry smiled. It was just like Iris to defend Barry and the Flash when anyone including him said anything mildly offensive.
"My point exactly." He was very close to her now. "You only see the best in people."
Iris smiled and looked him in the eye. "I wish you'd let me see you."
"I can't put you in that kind of danger Iris."
Iris took a step forward. "I'm a big girl. I can take care of myself."
"Iris-" that was as far as he got before she pulled off his mask. He may be the fastest man alive, but his shock made him slower. By the time he began to vibrate his face, it was too late, Iris had seen the face she had grown to love.
"Barry?" she gasped. "What? Why? How?" Barry stopped trying to disguise himself.
"Iris, I know I should have told you. You're my best friend, and you've always been there for me. I love everything about you. It was selfish, but I couldn't bear it if anything happened to you."
Iris was silent for a long time, and Barry began to get really nervous. What if she hated him? He couldn't lose her.
"Barry, never lie to me again." She spoke slowly and clearly, emphasizing each word. "Promise me. We never lie to each other again. By the time we leave this rooftop we will have no more secrets and no more lies between us."
"I promise."
They fell into silence again. The only things they had kept from the other were things they were too shy to say now.
"Iris, I've really only ever kept two secrets from you. One was being the Flash. The other . . . Iris, when I say I love you, I don't mean as a friend or a brother. I have been in love with you since I met you. I have only ever loved you. I will only ever love you. You and only you."
"Barry be quiet." Iris closed the space between them.
No more secrets.
Sorry, that was really short.