Freezing Water

"Mhm...do it again." "...Ed, it's been like an hour. I can only freeze and unfreeze a glass of water so many times before it gets irredeemably boring." "Suck it up, snow cone. We're not stopping until I figure out how the hell you do that." (Originally posted on Fullmetal Alchemist Amino and AO3; Rated T because of Ed's mouth) [One-shot]