GordonFreeman said: She messed with the wrong guy; not everyone takes kindly to getting a blowjob from an umbrella.
Also, why in tarnation is her umbrella wearing a sock and sandal?
Lolwut? Seems to me that Kogasa tried to surprise someone who definitely didn't take kindly to it, and raped her as punishment for pissing them off. She's saying "I'm sorry, I won't do it anymore" meaning she won't try to surprise the person again.
Poor Kogasa =( *takes her home to clean her up and console her*