Hang around the ritual shrine of your factions region.
I've been visiting both werewolf and vamp shrines (with my own werewolf and vamp toons) in the last few days and it appears that many gift-enabled werewolves and vamps head their to offer their services. If you can't get their safely you are probably not going to succeed with the quest line to complete the gifts.
Can see why posting in this forum is going to do anything other than verify the demand for being bitten, better to try in-game (although yes, the in-game comms is not very friendly for this).
Everyone knows the phenomenon of trying to hold your breath underwater - how at first it's alright and you can handle it, and then as it gets closer and closer to the time when you must breathe, how urgent the need becomes, the lust and the hunger to breathe. And then the panic sets in when you begin to think that you won't be able to breathe - and finally, when you take in air and the anxiety subsides...that's what it's like to be a vampire and need blood.
Francis Ford Coppola - BS Dracula: The Film and the Legend