Riku didn't normally drink coffee. He drank tea, and he had made sure Calhoun had known that since the day they met, making little faces when he saw her down a cup. It was too strong, he said. It reminds me of this really mean English teacher I had, he said. Doesn't it color your teeth, Sarge, he said.

He's made himself scarce for a few days, as he sometimes does. He needs to be alone some days; he doesn't check in because he's never been taught to. Just leaves, doesn't leave a note, doesn't give her a heads up. He may be her student in a way, but Riku's still far too used to being alone and depending on himself for a bulk of his time to really subscribe to that student mentality. Part of him already knows that he'd get skinned alive if he tried this in the Sky Force back home; part of him really doesn't care for the moment, because he feels a dark ache in his chest and he wants it to go away quick.

Being immune to other's Darkness didn't mean he could keep his Darkness in check. If he wasn't careful, he'd end up hurting himself, and maybe even some others.

... and he needed to wake up. He rubs his forehead with the back of his hand as he strides into the shop, right past Calhoun without a second glance, too tunnel-visioned to even look at anyone else while he's bundled up with a coat and a scarf. He orders a coffee (he makes a face and just waves a hand, ordering whatever the barista deems as 'good') and, once it's made, turning around--

And he spots Calhoun right there, and freezes up.