Guess who?
It's time for an astro math lesson: What do you get when you multiply one times one? Well, in real-world terms, you'd get one, of course. But in this case, when it's you times your friend, the answer gets into multiples, exponents and, heck, imaginary numbers. That's how high the charisma quotient goes when the two of you work your powers. You bring out the best in each other, and the magic affects everyone within firing range. Careful where you aim that stuff, now.