Sorry about the delay!
"Dude, you don't have to fucking knock because I know it's you," Donnie called from the other side of the door. His parents never came to the door unless their Mom was chasing him down and bitching him out. Besides, he had already told Sean it was cool to come in.
Donnie was sitting at his open window next to his bed as he waited. Normally he'd have it closed when he lit up but he didn't want to get Sean in trouble for once; his parents knew he did drugs already and didn't seem to care, probably gave up trying to change him. Thor was resting on Donnie's bed, with his head perked up after hearing the knock on the door.