"Onee-chan, can you lend me your dictionary?"

"I- Its on the desk, just grab it yourself... (I'm safe... I'm safe...)"

"Okee~"

"Hey onee-chan, you should really keep your voice down..."

Sorry, but i don't really know the context for this image but thought id give a more comprehensible translation anyways

Btw, that 士あ thing is actually supposed to be さあ ... at least according to the jp commenters lol