Pixicato

Oh, I love it. Romance is always more fun when there's the possibility of social awkwardness!

I don't know too much about particle physics, so just roll with me on this one... What if magic was an additional fundamental interaction, along with gravity, electromagnetism, and the weak and strong nuclear interactions? My theory would be that it would mediated by a "mason" (magic boson, and it needs a better name because it sounds like "meson"), and that that particle is very short-lived. It can add magic energy to things, which would then quickly convert into other forms of energy (light, kinetic, etc.) This would help to explain unicorn magic, and Sonic Rainbooms, in that when pegasi go incredibly fast some of their kinetic energy is transferred to magic energy, which excites surrounding electrons, emitting light... Just an idea, mind you, and not a very good one at that