Here's one...
The Big Bad is some kind of apocalypse beast who needs to suck demon energy to gain critical mass to destroy the world...it's killing demons and people in its quest. Angel and Spike end up fighting it, and it kicks their butts. Buffy appears, fighting, and gives Spike and Angel a bit of space. The beast eventually grabs her and starts to drain her. A talisman they've found earlier will allow a soul to be transferred to another body, and makes the recipient super powerful...but it dusts the donor. Angel makes to do the soul transfer thing to Spike, but Spike makes a big speech about how Buffy wants Angel, and he loves her so much he wants to give her what she wants...so he uses the talisman. Huge magicks erupt and Spike falls into Angel's arms, and just as (eewww, I can't belive I'm doing this) their lips meet (you're welcome, all you Spanglers) Spike dusts, and his soul enters Angel. Angel snuffs the Big Bad, and saves Buffy. She cries for Spike, even though she gets Angel, who became human with the addition of Spike's soul. Buffy also finds that the Baddy drained her of slayer powers (they are demon-based), and Angel is just a regular guy.
Buffy, cries for Spike and Angel says in Spike's voice..."but a bit of me is here, love"...and Angel says "yeah, a bit of him is...but I'm all me...really me." They walk off thru the smoke, Angel's arm around B's shoulder.
I'm no writer, so apologies for the style (or lack thereof).