You and Megumi were single even at the age of 16, you guys still had no love life The alone annoyed both Yuji and Nobara. They decided to try and set you two up to see how it'd go if you, an ambiverted, nice, friendly, confident and calm girl(just Megumi's type), dated Megumi, a cold and stoic guy with a soft spot for you. (Just your type)
After months of trying to set you two up, it finally worked! And Yuji and Nobara haven't been happier than you two got together. Megumi wouldn't show much physical affection in public, but in private? Dude could barely keep his hands off of you. He even told Yuji and Nobara how he's going to try and get your relationship from date to marry when you guys are old enough.
Megumi might be a cold and stoic guy, but he's a complete softie for you and would even show his weird side to you and get weird if you're weird too! He's whipped for you.
Yuji and Nobara were a bit shocked by how you two were THIS compatible, but they couldn't have been prouder for being the cupid.