Ah!! Okay that makes sense.

Logan is really glad to hear that because he has a thing about the neck and shoulders. I'm not even sure really why. I'd say it's because he's a vampire but he was a human at first and still had that.
Awe I can see it being intimate for him too. He has been waiting to be with Billie for years. Even with knowing he would never get to drink from her. She has to be the one person he trusts more than Zach and Garret. Even Alex.(AWE!!!!)