Marisa has succeeded in shocking and confusing the Yukari, who seems baffled by this turn of events, too baffled even to put up a boundary to stop the incoming glomp. Marisa can't really help herself though; Yukari is just that awesome.
I'm honestly surprised that a one-shot about Marisa with a glasses fetish didn't feature Rinnosuke, the one character in Touhou who CANONICALLY WEARS GLASSES.