Wow, can't believe it's been over 2 months since I posted here. I thought I'd update a bit, because a lot has happened in those 2 months.
So, yeah. You guys were right. I've got a massive crush on ... well, I'd prefer to call him "T" now, if that's okay. And you know what? I'm actually much more okay with it than I thought I would be. It started off really intense, like my brain would literally just wander off and/or stop dead at the very sight of T. So as a result, I didn't talk to him for a few weeks at least since "the shudder", as I've now grown to start calling it. But this luckily started to subside after a while, and I started talking to him again and just really liking being around him instead of deliberately avoiding him.
Then the flirting started. Oh gee. Everything just got a whole lot more complicated. I started to semi-consciously do things that I NEVER do with other people. Direct eye contact whenever he speaks to me; catching glances when I can for no reason; leaning closer to him if we sat next to each other anywhere (this one has caught me out a couple of times, when my brain finally catches up and realises that I'm within 6 inches of him I just shuffle away and try to hide my furious blushing... it's weird); and even light touches on the arm or whatever whenever it feels right. Oh god, reading that back makes me cringe but it's too true to be disappointed in myself, lol.
But overall, I'm cool with it: I just really like being around T, even if I act totally out of character when I am. It's also making me a more social and all-round better person in general, too: so everything is great right now. As for labels for myself, biromantic is DEFINITELY one: but as for the -sexual suffix, I'm not so sure. But to be honest? I really don't care much for that label anymore. I just go with the flow of my own crazy brain and see where it takes me xD.
And I wouldn't be in such a good place right now if it wasn't for my long-ass post 2 months ago, and all the advice and support that you guys gave me: so thank you!
I'll probably post an update again sometime in the future, because all you wonderful people deserve to at least have some idea of what's going on after all the help you gave me. Thank you again! \o/