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Bruce always knew he would die first, to be fair he was dating and eventually married an alien who could take bullets, so.. when he started ageing it wasn't exactly scary, he watched his kids grow, he went to Damian's graduation from college, and once Damian got a job and his own place.. Then Terry, though he was only around in the Batcave.
There were no kids in the house constantly to keep his hair from going grey, outside of the occasional visit, or his grandkids or Clark's grandkids coming over.. He started to age.
Clearly, and well, physically it looked like Bruce Wayne famous Playboy had a younger man on his arm, which was a field day for the tabloids.. until they realised it was the same guy from years ago, then they just thought Clark had some secret unaging recipe, which.. If only they knew.
Bruce didn't mind it, Kal was young by Kryptonian standards.. even on their home planet, but.. after a while it seemed to bother Clark, and Bruce.. was a couple of years ago, now, Batman so he of course noticed.
The moment he had to get a cane to get around the house without pain, [prematurely mind you because of old injuries], Kal began seemingly going out more often and being more attentive, and Bruce being the paranoid man his brain just thought that Kal was cheating.
Bruce was more upset about the lying than anything else, of course he couldn't keep up with Kal.. in most ways anymore, so he'd rather understand if Clark wanted to open the relationship but at least tell him.
He sighed slightly when Kal came home from another long night "saving people".
Sure.
"Brucie I'm home!"
He had begun using that name for him, Kal considered it sweet, Bruce considered it annoying.
"Kal.. Where were you?"
"Kal..? Huh.. I was saving-"
"Don't give me that."
Bruce gave the batglare™, he never lost his ability to do that, and it always made Clark shiver, the walking stick clacked on the floor as Bruce moved forward.
"You come back with those furrowed eyebrows you used to get when you'd get lovingly focused.. and you aren't wearing your suit.. If you're seeing someone else I would rather know than be left in the dark."
"Seeing? What! No! I- never!"
Clark moved forward holding the lower part of Bruce's back, the closeness making him have to look up at the other man, he realised he had to strain his neck more than he used to.
"I would never do that, Bruce I swear."
"Well then where have you been? And why have you been ditching my trackers? I understand I am.. old now but I-"
Yes, Bruce had planted trackers, he had even sent some of his kids after Clark, though without telling them what was going on.. which was hard to do but what had to be done and all.
And how Kal went red told him something even if he didn't know what was going on.
"Oh dear.. No, I.. was.."
Bruce stared, leaning a bit more onto his cane still giving the Batglare™, he barely noticed when Clark had begun to lift him after a moment, only slightly, just enough that Bruce didn't have to hold himself up, but still was able to step back and pull away.
"Taking classes.."
"Classes?"
Bruce was now confused, Clark had a job, still at the Daily Planet, and he was getting part of Bruce's fortune.. so there was no need to take classes and hide it, unless it was for a surprise which Bruce didnt really believed because if it was for a good surprise Clark, Kal would be all smiley, and trying not to look Bruce in the eye.
He was.. just, nervous.
"What classes?"
"How about we sit down love?"
"No, we talk now, I am not old losing my memory."
Clark sighed again, adjusting his glasses on his nose with his left hand, his right still supporting most of Bruce's weight.
"C-classes to look after.. you know.. older people.."
"Huh?"
That.. actually stumped Bruce, he wasn't exactly expecting that, he was expecting cheating, or some answer about Bruce being unable to keep up.
But classes to look after old people wasnt exactly it?
"Your getting older, I don't want you to have to push yourself beyond what your able too, I want to be able to look after you the moment you couldnt look after yourself, ive realised now that you will live less then me and eventually you'll need help doing basic tasks, and you will be already prideful about it so I wanted to make it as eas-"
"Pft- Clark.. you.. are taking classes, to look after me.. I only have a cane Clark I can still walk."
The blush on the southern man's skin grew making him look like a tomato.
"Yeah.. but isn't it better to know how to do it now.. so I don't have to know later..?"
"I have enough money for a live-in nurse.. and again, I am not at all old enough to need any of that yet."
"You are 71 and you wouldn't higher a nurse like that."
"And once more I am only now going properly grey, and the grey at my temples didn't count."
"Y-yeah but-"
"You're very sweet, Kal.. but I am fine.. I am old, but I dont need a nurse yet.. not to feed me nor to wash me"
"I am not stopping taking the classes."
Bruce had to fight the smile, leaning up and giving the alien a kiss on his lips, a loving little peck, and still all these years later clark blushed at that.
Then bruce put on the old man act he used for the paparazzi that still came around sometimes, giving this whole performance of putting a hand on his heart and all.
"You dont need to stop, but if you really are taking those classes, you can give me a bath then, for all this stress you put me through, it cant be good for my heart- ah!"
And with that he was up in Clark's hands being carried up the stairs, his cane forgotten on the floor, tonight was going to be a long night he could feel it..