[This guy here is currently flopped on a bench in the park, not far from where Ian is standing, and definitely not too far for him to not hear the loud exclamation--]
Oh my god. [Stiles, his journal open and looking at the exact same post Ian is looking at, lets the journal fall on the bench so that he can adequately express his feelings on the matter by flailing his hands around for a moment before massaging his temples.]
For the love of god, no, that is not how surprise parties work! [jfc Daigo]