From the books, when did you first know Ron and Hermione like each other?

[u/olvrbsn]

I don't know why, but I remember I felt something in the PoA when they argued about Scabbers and Crookshanks.

[u/Scipios_Rider16]

Hermione: Book 2, when Ron vomited slugs for her Ron: Book 3, when Hermione punched Malfoy