Ok the first one is an AH/AU. Buffy is away at a stateside boarding school (it's a Catholic school I think), Willow is her roommate, and she loves photography. Spike is at an all boys juvenile center located in the woods, and he sees her as she is "playing" Ophelia, in the lake, while taking pictures of herself. They meet &fall in love (of course). I do remember Buffy getting the school to host a dance for the boys at the juvenile center, and her and Spike eventually run off and stay at a cabin, which leads everyone to think that he kidnapped her. In the end everything is set straight and Spike is released from the center by his mother, and Buffy's parents (or at least Joyce) gives her permission to be with Spike.
The second story is on adultfanfictionnet, I know for a fact, not sure if it is anywhere else. It's AU, and it starts with Buffy dumping Spike. And somehow he ends up going to another world, where vampires can walk in the sun and he is royalty. He starts to make a life for himself there, and when its time for his coronation Dawn and Buffy both come to see him. Dawn is happy to see him and Buffy is withdrawn. Spike tells her that he is through being dirt in her eyes and that he is staying where he is, and that Dawn was welcome to stay but Buffy had to leave. The storys summary starts something like, what if Dru was correct and Spike did live in parrallel worlds, or something along those lines. when I last looked and this was about a year ago it was a WIP, so it may be finished now. | 
