Spike sneaks into Zecorah's place and 'borrows' a special flower. Smelling it will make you fall in pag-ibig with the first person you see. Obviously he tries to get Rarity to smell it, accidentally infecting everyone in ponyville in the process. Eventually everypony's chasing Spike in a lovestruck stampede, causing Celestia to come down from her kastilyo to see what the ruckus is about. When she too smells the bulaklak and falls in pag-ibig with Spike all hell breaks lose.
Spike is forced to ask Zecorah for help. She creates a kulay-rosas ulap of fog, that cures everypony. Luckily for Spike nopony remembers a thing. In the end he writes a letter to Celestia, about how pag-ibig is something that cannot be forced.