(Note: Some things may happen a bit differently than in the actual books.)

Characters: Heatherpaw/tail and Lionpaw/blaze

When: Mostly when they were apprentices and new warriors

About: Heathertail and Lionblaze's fobidden love and the aftermath of when the stopped seeing each other. 

Script: 

Part 1 - Now and then I think of when we were together 

Like when you said you felt so happy you could die - Flashbacks of them in the tunnels as apprentices

Part 2 - Told myself that you were right for me
But felt so lonely in your company - Them laughing together but then Lion looking over his shoulder guiltily. 
Part 3 - But that was love and it's an ache I still remember
You can get addicted to a certain kind of sadness - Lion in his nest, looking restless and sad, try and find some was to integrate Heather into it. 
Part 4 - Like resignation to the end, always the end
So when we found that we could not make sense - Lion entering the tunnels with his tail drooping and singing the words "We could not make sense" 
Part 5 - Well, you said that we would still be friends
But I'll admit that I was glad it was over - Heather looks sad but sings the words "We could still be friends" but Lion looks disappointed but relived as he leaves the tunnels. Part 6 - But you didn't have to cut me off
Make out like it never happened and that we were nothing - Heather ignores him as they save the kits and is appears close with Breeze
Part 7 - And I don't even need your love
But you treat me like a stranger and that feels so rough - He glares at her but then looks away and his expression turns to longing. Part 8 - No, you didn't have to stoop so low
Have your friends collect your records - Later, Windclan appears through the tunnel and you see a close-up of Lion narrowing his eyes. 
Part 9 - And then change your number
I guess that I don't need that though - He looks wildly around the crowd for her and when he can't find her he leaps in anyway. Part 10 - Now you're just somebody that I used to know
Now you're just somebody that I used to know
Now you're just somebody that I used to know - Part will be switching between flashbacks of him with Heather and him in the battlePart 11 - Now and then, I think of all the times you screwed me over
But had me believing it was always something that I'd done - Flashback of Heather going back to Windclan through the tunnels, looking kind of ashamed. 
Part 12 - But I don't wanna live that way
Reading into every word you say - Heather laying in her nest, looking slightly ashamed 
Part 13 - You said that you could let it go
And I wouldn't catch, you hung up on
Somebody that you used to know - Heather leaping into the battle, and seeing Lion on top of Crow, looking like he's about to kill him and leaping in to stop him. Part 14 - But you didn't have to cut me off
Make out like it never happened and that we were nothing - Lion realizing what he was about to do and running away. 
Part 15 - And I don't even need your love
But you treat me like a stranger and that feels so rough - Lion, grabbing the catmint from Windclan territory and then Heather confronting him in the tunnels. Part 16 - And you didn't have to stoop so low
Have your friends collect your records - Heather mouths the words "You didn't have stoop so low" gesturing to the catmint in Lion's mouth, pan around to look at him and show him glaring. 
Part 17 - And then change your number
I guess that I don't need that though - Him getting back and looking sad as he thinks of Heather again but then pushes it away. 
Part 18 - Now you're just somebody that I used to knowSomebody (I used to know) - Show Lion walking up to sit beside Cinder and curling his tail around her's. Make it sunset or sunrise
Part 19 - Somebody (Now you're just somebody that I used to know)
Somebody (I used to know)  - Pan upwards to the sky, make it sunset or sunrise, and the the name of the map written in the clouds or the stars or something like that.
Part - 20 - Somebody (Now you're just somebody that I used to know)Somebody - This will be the beginning of the credits, have two walk cycles, one of Heather and one of lion, have them both in the center but walking in different directions and have the Windclan moors behind Heather and the Thunderclan forest behind Lion, make bother their faces serious but somewhat expressionless. Make it loop so that it will keep going for long enough for all the credits, even after the lyrics are over.

Whoo, this was a doozy, more coming soon.