[Worry not, Ain also has tricks up his sleeve, mostly called "being a magical nuke" and "too stubborn to die". But they don't need to have that conversation now.

Vash says Ain makes him happy. Ain has established he's happy. Therefore, the trilling begins, though this time it's a soft song and not his usual loud twittering. This is the sort of joy that's quiet and peaceful and warm-feeling. One Ain usually doesn't get, on account of he has a hard time with emotions in general.]

Then... Haha, I want you to rest today, okay? Take it easy, since you don't do that.

[Not "we don't get to" but "you don't", which isn't meant to be as backhanded as it sounds. They're both aware of their situation, but this is one in which they can relax, and Ain insists that they do.]

I can get us breakfast. Oh— would you want to shower with me, first? I cleaned you off a bit last night, but...

[Remember when he said "clean out"? Yeah.]