PERMISSIONS.
YES
Backtagging.
Thread jacking.
Comment spam.
Troll him.
IC consequences for his IC actions.
Stalking.
Weird text quirks, Homestuck-related or not.
AT YOUR OWN IC RISK
Hugging/Touching (if he likes you, he'll avoid it. If he doesn't like you, he'll stab you in the face).
Fighting (I like to figure out results of fights OOC before the actual fight happens, though, so throw me a line about it?).
ASK OOCLY FIRST
Private post hacking.
Mind reading/Empathy/Telepathy/etc.
Winning/Losing fights. I don't handwave or assume when he fights others without asking, and I appreciate if others do the same for me and ask.
Any permanent damage.
NO
Death.