Funny, I just reread Older( for the fourth time). I absolutely love the younger Buffy with the older Spike storyline so here are some of my favorites.
Tainted Innocence by Peroxide_Dreams
Summary:
After being dumped by her boyfriend Angel, sixteen year old Buffy Summers is forced to spend the summer with her mother's boss Cordelia. Just when things are starting to look up, Cordelia's playboy husband Spike turns her world upside
http://dark-solace.org/elysian/viewstory.php?sid=1591&warning=NC-17Falling Down To Summerset
Author: MrEeee
ALL HUMAN: Full summary in author's note, Spike is Buffy's teacher. Taboo, M in future chapters. Read for giggles and spuffy goodness. Lot's of shirtless Spike included.
http://www.fanfiction.net/s/5379688/1/bFalling_b_bDown_b_To_SummersetBaby Love by Niamh Rated: NC-17
Summary:
Seventeen year old Buffy Summers is a High School Senior with a boyfriend and life is great, until she realizes one morning that, well, life changes fairly quickly, especially when you find out something you've been denying is real.
This is a teacher student story.
Forbidden Passion by serenity
Summary: Seventeen year old Buffy Summers is the best friend to Cordelia Chase, the only daughter to actress Evangeline Chase who has an affection for younger men. What's a high school senior to do when she starts lusting after the latest boy toy at the Chase mansion? This starts out as a high school fic, but will not stay that way. BTW...I suck at summaries.
http://spikeluver.com/SpuffyRealm/viewstory.php?sid=26911&warning=NC-17Hope this keeps you busy. Enjoy!