backtagging: Go for it, but getting a response is like Russian Roulette.
threadhopping: No idea what this is, but it sounds fun.
triggers: Pretty much nothing.
flirting: Sure, but don't be mad when he follows you home.
hugging: Bring it in.
kissing: Bonus points for tongue. Unless you're Venom, then minus points, shame on you Mac.
fighting: Bring it on.
injuring: Go for it.
killing: You can try. He has.
using telepathy: Not very effective. He's nearly impossible to read because he's borderline batshit.