On the ground, next to the mailbox, there is: a weird rock!
Okay, no, he's getting too far into his own head. Time to change the mental subject.
How about making some more magic?
Yeah, that helps. He can make a handful of twos and a few handfuls of ones. At one point he realizes it'd be extremely convenient if he could consolidate the rocks, turning seven ones into a two, but even the three can't seem to be able to do that. But that's all right - a roomful of ones isn't exactly the worst problem to have.
He should probably use them more liberally, though. Another thing to ask Sylas about.
The next week passes much as the first one did - Seiji makes about five ones per day just incidentally, and it's fun - possibly to a slightly concerning extent, but he decides that as long as he's not getting notably injured there's no real harm - to make magic before bed.
"Oh shit, let's get that under some cold water-"
If he steers her to the sink, he can probably wish on a two without her noticing that the burn is less severe than it should be. He can't get away with healing it all the way, obviously, but he can at least help.
He turns his face away so that his grimace won't show, but unlike with his pain, her pain vanishes once he's used it. Probably not for her, though, so he makes sure to follow through with his original plan of getting her hand under a stream of cold water so that it isn't too suspicious when he spends his two to mostly-heal it.
Yeah, no problem, he's just glad that she's okay, yeah he thinks there's burn cream in the first-aid kit. No he doesn't remember where the first-aid kit is, sorry.