I just want to be happy

First moments they have, Powder is already invading his personal space and is very touchy. Could be taken from the fact that Pow is touchy in general. But after the dance it gets more intimate.

2. There was no need to hold his hand but the girl has to talk her to her man asap, then adding another touch of comfort after she scolds him for not sleeping properly.

3. They draw each other with/in hearts and apparently also give each other flowers with 'I <3 YOU' notes.

4. Someone "just crushing" wouldn't be able to be this confident when approaching said crush.

4.5. Extra detail: Powder's shoes having original Ekko's outfit colours matches when Ekko had Jinx's stripes on his own during the battle.

5. She was WAY too casual during the first lean in, almost as if it wasn't the first time they've done this. Note: she's already aware there's something going on with Ekko and backed away when he did because she didn't wanna push him.

6. That's because it wasn't the first time, per confirmation on Ekko's part. He probably asked Heimerdinger what his relationship was with Powder along the way, leading him to ask the 'first time' request when kissing her was no longer avoidable.