Well that's. Well that's a lot.
He eventually has to grab his stuff, and the flowers, and go find an empty classroom to sit down and read the entire thing, and process it. And there's a lot of processing going on.
He appreciates the compliments (he thinks), though the implications (okay, outright admissions) of stalking are... concerning. And the revelation of magic even more so? He supposes that... well, everyone knows that upsetting the Blakes, or the Strands, or especially the Favreaus, is a bad idea, for somewhat unspecified reasons. And that the woods are a dangerous place to go after dark. And that... okay, he hadn't quite put it together before, but the evidence is pretty clear that something is weird in Lakeview. Magic still seems a bit farfetched (though there have been quite a few small fires in school the past few years. That could just be Jess Favreau being a firebug, and getting out of it on her family name, though), but she has promised him evidence.
The offer she's made to him...
He can't say he's not intrigued. Or enticed. Whatever evidence she has (from the books he reads, which she has apparently been reading as well? From his internet history? I couldn't be just the books, how much stalking has she been doing?), she does seem to have a... correct picture of the kinds of things that he's into. (Despite having complicated feelings about them...) But that's the sort of thing for storybooks and fantasies (though if magic is real, they're already a third of the way to fantasy already... no, he shouldn't be giving himself excuses), not for real people.
And as for who she is altogether, well, she's a lot. She's a Blake, which is its own can of worms, but even ignoring her heritage, she's a lot. Extremely... girly, for lack of a better way of putting it? The handwriting and the hearts and the pink (she does she loves all her children equally, which is so much even on its own, but she clearly has a thing for pink) and the overwhelming enthusiasm is pretty clear throughout the entire piece. Is this the kind of person he wants to date (or own, which is a thought that gets him turned on and ashamed all at once), or should he steer clear? The Blakes are the least bad family to get on the bad side of, so everyone knows (and how do they know, really), and despite her assurances he's still a bit wary of upsetting the scion of the Blake family.
Possibly, instead of trying to figure out who she is from this (admittedly very revealing, but clearly carefully constructed) letter, he should... try talking to her directly? Even if he's still concerned about everything he's read. That might give him a better picture of what's going on, a better idea of what he's getting into. He doesn't remember the incident she's describing (it wouldn't be the first time he's helped someone pick up their books, though it's rare enough), and he doesn't recognize her (unusual, though not that unusual for the Blakes, yet more evidence that something is up with this town) name, in either form, which means she's not in his grade, so he hasn't actually met her. He needs some firsthand experience with her.
He thinks this over some more after gathering his things up as he bikes his way home, starts his computer, and composes an email.
Rosy,
He starts, unsure which name to use at first before realizing he should probably pick the one she's chosen for herself,
I've received your letter. And read it. I'd... like to take you up on that offer of proof you mentioned. I know that there are some odd things going on in this town, but I think I'd like to be certain of magic before anything goes any further. And besides, it might be a good idea for us to meet, and talk, given, well, everything you've said. Where and when works for you? I have homework, but I can probably take some time off to meet you if you have a reasonable time and place in mind.
John
He dithers for a while, reading and rereading it, before pressing send and trying to take his mind off of it by working on the homework he does need to do. It doesn't work very well.