He looks so utterly delighted by her admission, by how quickly and earnestly she gets it out in the rush before their son needs to breathe. He worries sometimes about how he handles parenthood, but Jyn is always there to kick the reminders that he's doing fine.

He doesn't get the chance to respond, but he does give her a very knowing sort of smirk.

Mateo, oblivious, just cheers at his new five minute record and squeezes his papa's hand. "Five minutes!" He is so pleased with himself, even as his mother's suggestion sinks in and he makes a thinky scrunchy face. "Do you really think it could be longer?"

"Much longer," Cassian agrees.

Mateo frowns with how much he's thinking about it. "Maybe," he says. "But I just wanna keep playing right now." He takes a deep breath, ready to go back under all over again. "Count again mama!"

And pop! Splash! There he goes again, under the water. Did he actually want to try again, or is this a very Erso means of avoiding the question? It's a mystery.

Cassian looks back at his future wife. "We can always do something about that later, after they are both asleep."