I genuinely find most of the explicit heat for them comes from subtle, stolen moments in longer fics rather than outright smut. There's this one story, can't remember the title now, where during the rebuilding of Casita, they're moving debris and their hands brush over a piece of wood. The author spent like three paragraphs just on that touch—the grit, the warmth, the way Camilo didn't pull away immediately. It wasn't about grand passion; it was about shared exhaustion and this quiet understanding that they were the only two in the family who really knew what it felt like to be... not quite enough, but in opposite ways. That tension of being mirrors of each other's insecurities gets flipped into attraction really well when writers lean into it.
Another common beat is during Antonio's gift ceremony aftermath, imagining scenarios where they're both left awake while everyone else sleeps. Camilo using his gift to shift into someone else to make her laugh, then shifting back, and the room going quiet. That shift from performer-audience to just two cousins in a dim room gets leveraged a lot. It walks a fine line, but some writers handle the transition from familial comfort to something else by making it about seeing the real person underneath the roles they play for the family. The heat is in the vulnerability, not the action.
Honestly, the ship isn't my primary jam, but I've stumbled across it. The moments that actually make me pause are the ones that acknowledge the weirdness. Like a fic where Mirabel accidentally walks in on Camilo shifted into her, just staring at her reflection, and the sheer bizarre intimacy of that. It's more psychological heat than physical, which fits the characters better anyway.