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The thing about Louis’ and Harry’s dynamic is that while Louis is the instigator of 99% of the foolishness, Harry will always come back at him with something ten times dirtier than whatever Louis had thought up. Of course, Louis can’t let that go, so he does something else, so Harry has to do something else, and then it’s a vicious cycle that continues until one of them makes a plea for a truce.
It’s like that even when they’re at home. Sometimes it’s like that especially while they’re at home, because Louis gets bored easily and Harry is just such an easy target. The point is that the kind of foolishness that Louis is known for doesn’t stop when the cameras stop rolling, so when Louis lets himself into Harry’s bedroom at 5:30 in the morning to annoy Harry into waking up before he goes for a run is completely normal and to be expected.
Except that it turns out not to be so normal.