NOTE: soooo, originally this was all just an elaborate headcanon i was typing up on tumblr. but then it started getting longer and more detailed. I was dividing the sections by pairing and making it chronological. And i was like, "well might as well make this a fic if i'm doing this much. people might read it."

Each chapter is going to be a different ship, and it's all in chronological order. LETS DO THIS!

Chapter 1: Kagami's First Boyfriend Was Tatsuya

Kagami and Tatsuya were the cute and sweet middle school 'boyfriends,' experiencing a whole bunch of firsts together.

They spent tons of time together as kids with basketball and learning from Alex. It was in middle school when they tried some stuff. It wasn't any kind of "official" relationship that they recognized, but they experienced lots of firsts together, just messing around.

Tatsuya always seemed way more comfortable with trying anything for the first time whereas Kagami was always awkward. Tatsuya would gently tease him and then express some physical affection, like ruffling his hair or running his fingers down his arm or caress his cheek, despite Kagami's red red face. It may have been Tatsuya to always suggest things and bring things up for the first time, but once they were into it Kagami would always take control, and that was one of the things Tatsuya liked about him. He didn't mind initiating things when it wouldn't be long before he could surrender all control to Kagami.

Tatsuya would climb onto Kagami's lap, and smile and kiss him, and their kisses would get more forceful and intense. Gracefully, Tatsuya would rotate, while kissing, and slowly lean back so he'd be lying on his back on the couch and Kagami would be on top of him, still kissing.

After doing each thing once, it was incredibly likely that next time Kagami might initiate.

Kagami looked up to Tatsuya and wanted to be close to him, but was never good at expressing himself. Tatsuya liked that Kagami looked up to him. He liked the attention, especially as it became noticeable how quickly Kagami was improving his basketball skills, to have Kagami still still revere him like that boosted his self esteem. It was a temporary fix for a growing problem, in which Tatsuya wanted to actually prove himself Kagami's better, but he couldn't do that as long as Kagami had him on this pedestal.

His frustration and feelings of inadequacy merely worsened with the game that Kagami let him win out of pity. Their relationship didn't really "end" in any finite way with the argument. Kagami returned to Japan so neither of them got closure. It was one whole big ball of unfinished business, and life got in the way.