Backtagging: Yes, forever and a day yes.
Threadhopping: With a heads up OOCly, yes.
Fourthwalling: No

Hugging: Sure, but he's not a very huggy guy, so hug at own risk
Kissing: See Hugging
Flirting: Sure, though if he's in a mood he may not flirt back
Fighting: Absolutely
Injuring: Of course, though, realistically, he's one fast vampire, and strong so there may need to be some ooc convo just for keeping things real
Killing: Immortal and can't be killed, so no.
Telepathy/Mind Reading: Yes, but I'd appreciate some OOC contact first.

( Kinks )