What story should I finish first? All hourglass to bursting, obviously.

A girl uses magic gum to blow up her rival, every bubble she blows pumps her up until she pops

A girl casts a spell to be curvier than her rival. The other girl does the same, causing them to grow out of control until boom

A girl forces her rival to drink one weight gainer shake after another until she blows

Something else (leave a comment)