honeybee

This is a bit different from what you asked for, but I actually have an idea that I've been sitting on for a while so I might as well share it

The main idea is that Bruce got kidnapped, taken somewhere remote and far from the nearest civilization, while Clark was away on an emergency mission. Clark had just returned from a battle that left him severely depowered by the time he learned of the kidnapping. It took him a considerably long time to track Bruce's heartbeat and even longer to superspeed into the location they're holding Bruce in - an obvious sign that he wasn't in tip-top shape for the rescue mission, but for the sake of the plot let's say he's the only one who's able to save Bruce as fast as possible. And like, his Bruce is the one in danger. Of course Clark's going to save him.

He eventually took care of the kidnappers and got Bruce back, but then to his horror, Bruce had to gone to labor.

With no guarantee of taking Bruce to the nearest medical facility in time, they had no choice but to deliver the baby themselves.

Unsurprisingly "birthing the baby with no immediate access to a medical professional" was one of Bruce's many contingencies when it comes to his pregnancy, so while there were definitely hurdles, they managed to deliver the baby successfully. And while the three of them managed to survive the whole ordeal, I can imagine Bruce's health taking a hefty toll because of it. Maybe some health-related issue(s) that forced him to stay in the medical facility for a length of time, or a permanent injury of some kind.

here is the link: https://ph.shp.ee/ToqSDW5a