He was always so amused by her. She was the only one who had the guts to talk back to him and get in his nerves. 

"i remember being d by a subway -"
"i told you many times that wasn't me!"
"ooh! I didn't mention it was you though?"

"i think we need to clear things up before anything else"
"agreed"
"so did we sleep together or not?" 

"jagiyaaaaa, i was waiting for you but you took so long! I feel really tired today, was it because we had a crazy night yesterday?"

"please lock you're door, i might accidentally go in later"
"what?"
"just kidding, i was hyper again sorry"

She always took him by surprise. Wether it be her suddenly entering his thoughts when he listens to music that usually calms him enough to temporarily treat his insomnia, or her literally barging into his vision first thing in the morning when he opens his eyes. 

"aiisssh why is it raining so suddenly?and to think i washed my hair this morning"
"people normally wash their hair in the morning, it's nothing special"
"really?"
"yes"

He fights back a grin and turned towards the raining sky.

Today again, she amuses him to no end.