Clark pushed up his glasses as he locked his rental car door. He went up to the mansion and knocked before entering.
"Bruce, I'm here!" He put his suitcase on the ground and walked to the dining room. There were crumbs, a phone, and a jacket where Bruce sat. He looked around him. "Bruce?" He listened carefully for his heartbeat. It wasn't far at all. It was a little fast, but nothing that worried Clark. He followed the beating heart to Bruce's room. He knocked on the door. It was already slightly ajar so it opened more. Clark poked his head in and looked around. There was a lump under Bruce's blanket on his bed. He walked towards it.
"Bruce?" He pulled back the comforter. There was the rich superhero laying in the fetal position, drenched in sweat, and pumping his fingers into his slit. Clark was a little taken aback. He had never seen Bruce like this. Maybe he had only seen the beginnings of his heat because this was different. He moved some wet hair that was sticking to his forehead. That got Bruce's attention. He grabbed Clark's wrist aggressively. He bared his little fangs before realizing it was a friend. He let go of the other man, and pulled the blanket over his shoulder, hiding his body.
"So-sorry. It died," his voice was a whisper, "sleep here and don't leave," Bruce tried to keep his sentences short but was having a hard time getting the message across. He curled up as a wave of horny pain hit him. He gritted his teeth and groaned.
"Bruce," Clark tilted his head.
"Fine," he huffed. "I'm fine," he managed to get to the point. It hit him again. This time he sobbed as it happened. Clark was panicked. He's seen Bruce walk off broken bones, and bullet wounds like they were nothing. But this was hurting him so much he couldn't contain his whimpers. Clark sat on the bed and stroked his cheek with his thumb.
He didn't know that heats could be so painful. He was told they hurt without help, but Bruce had the highest pain tolerance he had ever seen, he was sure he was breezing through it as if it was just a paper cut. Sure- the starts of heats he saw had Bruce a little weak but he assumed it was because they caught him off guard.
"Bruce," he turned his head towards him, "how… how much does it hurt?" Bruce looked at him. He snarled, showing off one of his fangs. "Come on, bats. What can I do to help?" That shocked Bruce. He looked at him with surprise but then turned away and huffed. Clark leaned over and put his arms on Bruce's sides, caging him in. "Bruce. You didn't tell me it was bad. Do… do you need my help?" Clark only wanted to make sure Bruce was okay. It wasn't a good time- but it was what he needed to do.
Bruce looked at him. His signature scowl was plastered on his face. He shook his head, but then another wave hit him, harder this time. He felt like he was going to die. Although he thought that every heat. After it passed, he realized that Clark was not only naked but under the blanket and holding him. Bruce didn't want his only time with Clark to be during his real heat. But there he was. His warmth against the omegas back, and the feeling of twitching cock jolting against his slit made the ache only worse.
Clark trailed kisses from Bruce's jaw to his collarbone.
"I've got you, bats. You're going to be okay," he whispered.