Hiroki sighs happily. He's utterly enjoying the affectionate indulgence. He gladly returns all the kisses. Ah-

I love all of you. But you know that already.

And then the question. However, he wonders what could see possibly want for, when Ziggy's already doing everything with so much feeling-

Surely there are things, but they escape his mind for now. So, for now, all else there is at the moment-

Slightly halted and sheepish,

Hey, Ziggy? I want to hear your heartbeat now, too.

Because isn't that childish? He hopes it's not.
He knows by heart by now where it is, so he's looking near there already, right now.

I'll prolly remember what else I wanna in the meantime.