Ranboo was the first to figure out that there was something between the two, living with them and all. But it started with the touches; Phil relaxing into Techno on the couch in front of the fire, Techno resting a hand on Phil's shoulder in the kitchen, both of them gravitating towards each other when they're outside chopping some wood.
Then it was the more intimate things, like Phil taking care of Techno on the rare time they were sick, Techno preening Phil's wings after a rough trip into the nether, both of them guiding each other on trying new things.
But the jewelry was the curious thing- Techno, with all of the dangling gold chiming on their ears, had shimmering, pearlescent down feathers intertwined. And Phil, laid across his golden locks, had a gold and obsidian laced circlet dancing with yellowed light.