Disclaimer: Yeah, nope.
As he got older it became clearer that he inherited traits from both his mother and father. One night, after years of being read bedtime stories by Suess, Sendak, Dahl and Rowling, Thomas had gone to his room to change into his PJs, Oliver had distracted Felicity. When they had untangled moments later, Felicity went to check on her son, only to see Thomas, the accomplished 2nd grader, sitting in bed in the dark with her worn copy of the first Harry Potter book open and her e-reader casting a glow on his face from in his hand, already halfway through his second chapter. "I couldn't see the pages in the dark, so I found the right page from the book on this momma, the snake's talking to Harry!"
Thomas' intelligence was recognised by his parents early which meant that Felicity insisted on a higher level of education and Oliver made sure his son had the best. His private school was wonderful,, on Thursdays he stayed back for an extra period of physical activity and he excelled there too. From a young age he kept his parents on their toes, with his penchant for climbing furniture and sprinting off in the direction of familiar voices, be it Roy or Barry, in busy public areas. The adults often argued over who he ran for faster.
Roy, Diggle and Lyla sat back on the training mats, laughing at Sara and Thea's arguing. Sarah claimed the top spot as Thomas' favourite aunt. Thea rallied, pushing her own case, arguing back that it was only because "Sara is the cool aunt that shows up as a surprise and always brings cool presents", she may or may not have tossed the cough covered word "bribe" after that. She backed up her case with a "he sees me all the time and still gets an excited smile on his face!" Thea argued that she should get bonus points because Thomas still got excited when he saw her even if he had seen her the day before.
However none of them could contend with the way his ear's literally perked up when he heard Felicity, no one got tighter hugs than she did or the way his eyes brightened when he saw his dad, the sparkle seen there unmistakably identical and a constant reminder for Oliver, of Felicity's eyes.
When Oliver secured QC again, John was promoted, Black Driver no more. Oliver appointed him to head of security for Queen Consolidated, citing John's ongoing excellent work as his personal bodyguard. It gave him reason to be around Oliver and Felicity during the day, coming in handy when there was Pointy Business, when Oliver needed advice and along those same lines, also came in handy when Felicity went into labour and Oliver was in a meeting 10 floors down. He's especially well placed now as Felicity; head of the IT department and Oliver are both called into an end of day meeting just as little Thomas is done with school. Thursday was the only exception of the school week where Thomas wasn't picked up by his parents personally, usually Aunt Thea or Uncle Roy were there after his extended sport day to take him out for ice-cream or hot chocolate depending on the weather and then Mum and Dad would be waiting for him at home. Unfortunately due to the impromptu meeting, instead of driving him home, Roy took Thomas up to his father's floor where both Diggle and Felicity had offices, John was left to occupy him till Felicity and Oliver got free. John, after all, being plenty experienced as a result of raising his own two girls.
When he had waved goodbye to uncle Roy through the glass, Thomas turned to his other uncle, he sighed a, "Hey uncle Digg," with the over-dramatic flair befitting Oliver's son and flopped into his father's desk chair and wiggled all the way back to be engulfed by the leather and leaving his feet to kick out just over the edge
"Hey Thomas, what's happening kid, big day?"
More dramatics as he blew his blonde hair from his forehead, the kid certainly had flair, "Yes! We had our first go on the rock climbing wall today!" Noticing early, Tomas' tendency to run out of breath mid-sentence Felicity had taught her son something she'd never learnt to do herself, pause between words. Or at the very least, sentences. "I reached the very top of the wall, it was only a small one, a kid's one, we had belts with ropes on so we wouldn't fall and everything. I got to ring a bell when we got to the top! Then we had to do this thing were we lean back, then hop down the wall towards the ground like a bunny but lying down in mid-air," he demonstrated his abseiling positing with active hand gestures, "it was so much fun. I'm going to ask dad if he can take me again; there was a giant wall for adults too. He's probably good at it, he doesn't even use his feet when he does that fishy ladder that mum likes so much. She always watches when he does it in the super-secret hero hiding place." There was always a wink that followed the whisper of super-secret hero hiding place, John watched as Thomas scrunched up his nose and squinted managing to blink one eye closed keeping the other open.
John was pretty sure that was more of Oliver's influence; though he still chuckled at the kid's keenly observed comments. Some things never change.
Wasn't sure about putting up a kid fic but the idea stuck so... yeah. In any case you got to the bottom, honestly, cheers for reading however much you did.