F=Feelings: When did they know they were falling in love?
Link knew before Zelda did. They were at a small luncheon hosted by a member of the nobility, She was in her element while he was still a little uncomfortable with being “The Hero chosen by the Gods, Banisher of Twilight, defender of the light and Hyrule” (it was a big change from being “Link the Goatherd”) so he kinda just kept to the edge of the party and tried to keep quiet during the meal so as not to draw attention to himself. He kept sneaking glances at her all they way through the event, thankfully no one noticed that he was gazing at her rather unabashedly.
She just giggled at something someone said to her and Link felt his heart race in his chest! Her smile just made him feel warm all over and it kinda just hit him when she turned to look at him that “Oh shit, I’m in love with my friend the Queen of Hyrule”
Zelda realized she was falling for him when she visited Ordon with him. All the kids where so happy to see him and they kept pulling at his arms trying to get him to go fishing with them or to teach them some new sword fighting moves or show off with the slingshot. Link was trying to keep them calm till Ilia showed up and all the kids quieted down.
Colin managed to fall over in the rush to see Link, scraping his knee against the ground. Zelda watched as Link ran over to him, lifting him up in his arms and helping to clear the wound. She was caught by how gentle he was being and how kind he was.
When Colin and the rest of the Ordon kids had been calmed down Zelda found herself fixating on how great of a father Link would become. Then she realized she was thinking about Link being a dad, then she realized she was thinking about Link being a dad to HER kids.
Then it hit her like “I’ve fallen in love with him… oh no”