Getting on the train of Billy knowing people before the suspendium incident.
I've seen people have him know the Kent's before, but more so either his parents knew them or he was a kid they were fond of.
Now what if he and Martha were childhood friends. Martha being maybe 3 or 4 years older than Billy and moved to Kansas with her folks shortly before the suspendium, where she met Jonathan and became middle school sweethearts with him.
So the Kent's for whatever reason have to evacuate to the watchtower, and its a fairly tense situation, but not not quite alarm bells all hands on deck.
So Captain Marvel comes up to the Watchtower for his usual Tuesday monitor duty when he happens to smell a very distinctive smell of cookies. A smell he could never forget, it was his best friends grandmother's recipe afterall.
So he wanders into the kitchen entirely not expecting to see the side profile of what could only be one of his best childhood friends, just 60 years older.
And Ms. Kent turns around with no clue as to who could be calling her name like that. Except the wording is oddly familiar.
She turns around to see a man that looked like her childhood friends father, but the cornflower blue of his eyes and the dropped jaw she always teased him for proved it was infact her friend
" oh my gods Mars you're alive?" And the Captain moves to hug his friend tightly for the first time in what is almost forever.
"Thats my line, what in hell happened?" As she hugs him back just as tight
Of course Clark is sitting at one of the tables with his father absolutely gobbsmacked.
Not only did his mother just curse, but she knew his colleague.
And Martha pushes her way out of Marvel's grip and levels him with a stern look
"No, before all the mush you tell me exactly what happened. You cant just dissappear on me for 60 years and then pop back up looking exactly like your father and not a day older than when I last saw 'im"
Captain smiles a little bit
"Gods its good to hear ya' Mars. It's Fawcett y'know? Sivana was tryin' one a' his inventions, combinin' all sorts of nonsense and ended up releasing a bomb that locked everyone in the town and stuck at the same age, I only just broke out last year. I figured everyone I knew was dead"
"The same age? But then how-"
Marvel cuts her off with a twinkle in his eye "magic, ill give ya the full scoop later"
Marvel finally looks over to the table to see both Jonathan and Clark staring slackjawed at the bith of em
"Flies boys" Martha says the same time as Billy chimes in with a "catching flies there?"
Sharing a small smirk between them.
"By jove, is this that boyfriend you were telling me about?"
"Husband now, of nearly 50 years"
"Well you sure know how to pick em, or shape them up I suppose"
"He didn't need all that much shaping" Martha chimes as she walks over to close her husband's mouth, clicking his teeth together softly.
"Wait...this is Billy? Like the Billy? From your hometown?"
"Same exact one it seems"
And yknow, of course being a fawcittizen helps mighty well when a child falls outta the sky and can suddenly lift trucks, fire lasers out his eyes, and freeze ya crops with a breath