I think Takahama is in the right this time. That cord is clearly a safety hazard, given that Daisuke already tripped over it page 1.
EDIT: Also that open socket on the extension cord with all the melted snow around is an accident waiting to happen
I think he bit his cheek to keep his arousal in check. He's gonna want to get some medical attention if he bit it hard enough to deal with all THAT.
Also, I am 98% sure that's the dragonewt who keeps stalking Miia at the end.