Thank you and sorry I took so long.
I have already posted something like that, or more like Clark finds out that the League already knows he’s dating Bruce.
But I wrote a little somthing for you anyway, it’s set in the Justice League Animated series btw
The JLA finds out Bruce and Clark are dating
(AO3 LINK)
The Justice League had finished a meeting at the watchtower an hour ago and it was already late. Most leaguers had gone home. The only ones left in the room were Superman, Wonder woman, The Martian man hunter and the green lantern, Hawkgirl and the Flash. Batman was still on the Watchtower but he went to his room to make a call.
They were discussing a space mission that Green Lantern, Martian Manhunter and Hawkgirl were going on and they had to leave soon. Flash stayed because he was on monitor duty. Suddenly, he got a call.
“I’m sorry,” Wally said. “There’s an emergency in Central. I’ve got to go. Can one of you cover my shift?” He looked at Clark and Diana.
Clark looked apologetic at him. “I can’t, I actually have a date.”
“Oh, that’s great.” Diana said with a knowing smile.
Clark flushed a little. “Although, he would understand if I have to cancel because of work.” Diana rolled her eyes.
“I can take your shift, Wally. Go.”
“Thanks, Di.” The Flash zipped off.
Now everyone was looking at Clark and he felt slightly uncomfortable.
“Yeah, thank you, Diana,” Clark smiled sheepishly at her. The Amazonian grinned back. “Of course. It’s about time you two have finally dates. Also, don’t you think he deserves a night off, too?”
Clark blinked at her in surprise. “How do you know?” But then he wasn’t too surprised that she had figured it out.
Diana chuckled. “It’s obvious. I’m glad you’re finally not dancing around each other anymore, it became painful to watch.” J’onn nodded in agreement.
“Hey,” John chimed in. “Can someone fill me in? Who is Clark’s mystery date?”
“Yes, I want to know, too,” Wally came in over the comm link.
Everyone looked at Clark again. “I’m not sure if I’m allowed to tell anyone yet,” he said a little unsure.
“Oh, come on,” Wally whined. “Diana already knows.”
“Yes, tell us,” John pushed. “Who is it?”
Clark opened his mouth as the door slid open.
“Me,” Batman said as he entered the room. Green Lantern and Hawkgirl gaped at him.
“Wait, is that Batman?” Wally’s voice came a little breathless over the comm.
“Don’t you have business to attend to?” Batman growled back.
“I can multitask,” Wally answered. “So, you and Supes are dating? Really?”
“Uh, yes,” Clark said and looked at Bruce.
“I just called Dick,” Bruce said, “Gotham will be taken care of tonight.”
Diana put a hand on both of their shoulders. “Great, then you two can go off to your date night.”
Clark sighed with relief. He didn’t like to keep secrets from his friends, especially something important (to him) as his new relationship with Bruce. So he was glad that the others new about it now.
“Yes, we should do that. Right, B?” He smiled at Bruce, who just nodded. “Thanks for not keeping us a secret. It’s good they found out,” said Clark as they made their way back to Earth and to Gotham.
"You would have wanted to tell them anyway,” Bruce said casually. Clark smiled even wider and kissed him.
They stood in front of the teleporter which was just activated and Oliver appeared. He grinned as he saw the pair and muttered, “Finally” as he went passed them and left.
(Now the question is, what does Ollie want there? Did he forget soemthing? Did Wally ask him to come? Is he seeing Diana? Does he want to join the space mission? Did I just want him or anyone come back and see them smooching? What do you think?)