This is kind of a start of a longer thing, but it's mostly a self-contained scene, it works on its own.
Set at the end of Season 4 Episode 16 ("Who Are You?").
Buffy/Faith (at this point mostly buildup)
PG
Disclaimer: not my characters. Some canonical dialogue lifted from transcripts
here and
here.
“I have strength you couldn't dream of. Adam has shown me the way, and there is nothing-” the vamp was shouting as he punched Faith, just before Buffy staked him.
And there she was, face to face with Faith. Except it was less a face to face thing and more of a two-way mirrory thing.
Funny how saving her life only made her more scared.
Her brain was too busy to process what that light blue rectangle of paper that fell out Faith’s pocket was, because then they were fighting. Punching, kicking, heavy breathing-Faith’s favorite foreplay. I wish slayage made my body this horny. Damn.
Suddenly Faith was throwing a flurry of punches, and shoved Buffy against the altar. Getting punched like that felt different in Faith’s body. Familiar, relaxing, almost like a massage. I’m letting her do this. Not really an observation she wanted to deal with right then. One well placed uppercut and Faith backed away. It was weird, punching herself.
“You can’t win this,” Buffy snarled with as much hate as she could muster, given the circumstances. It didn’t work. Can’t Faith’s mouth say anything without it being sultry?
“SHUT UP! Do you think I'm afraid of you!?” Faith yelled. But the advantage of fighting someone wearing her face is that she knew what she was feeling. But that makes it harder to hit back. Harder to hate back. Plus the whole looking the same thing. What was it that Willow said?
While she was distracted, Faith grabbed Buffy, knocked her to the ground, and straddled her. She was screaming, crying, punching Buffy in the face-Faith’s face. “You're nothing! Disgusting! Murderous bitch! You're nothing! You're disgusting!” When her face slammed to the right from Faith’s punch, she saw the light blue paper rectangle. Is that?-
A tear landed on Buffy’s cheek. No. Don’t think about that. This is the part where I grab her fist with the katra and change us back, Buffy thought. And she would’ve.
“Depart: Sunnydale, CA 10:05 AM” The sheet Faith dropped read. It was on the floor six inches away. It was a boarding pass, a plane ticket. An escape route.
“Fight back!”
It was well past 10. The story broke, what, 9:40? She would’ve been waiting to board by then.
Faith didn’t know I’d broken out. She thought she was the only one who could save these people.
“I'm evil! I'm bad! I'm evil! Do you hear me?!”
She gave up her escape.
“I’m bad. I'm ba-ad. Do you hear me? I'm bad! I'm bad! I'm bad. Please. Buffy, please, just do it.
“Buffy please, just do it. Just do it. Just kill me. Just kill me."
Buffy pulled her tight. “It’s ok.” Punches without leverage went halfhearted and turned into sobs. "It's ok."