So...Galaxina-the-Seedrian and I have been doing some RPing in the PM system, and we both love Gravity Falls and Phineas and Ferb...especially Phineas and Bill. I told her plans I have for a crossover, and in some of the RPing, we decided Bill was trying to turn Phineas into The Shadow...and then Gala and Woodland both turned me into a brony (Woodland started it by getting me to watch 'Unleash the Magic' and 'Twilight's Transformation' from MLP Equestria Girls: Friendship games...and...I realized how similar Bill and Cinch could be in this situation, so this was born. Hope you all like it. This is the only crossover that's actually just a one-shot.
Phineas stood with his back turned to the demon; his nose was pointed up in defiance.
"No way," he snapped.
"Come on, kid, why not just give in?" Bill taunted, "I mean seriously, you hate me."
Phineas rolled his eyes, "No way, I'm not doing it."
Bill sighed, "Seriously, kid…"
We both know you have always been my target
Wondered my evil intention
Well listen awfully clear
Cuz I'm sure that you will fear
The answer I have to that question
Bill flew around Phineas, poking his nose- -something he really hated- -, and Phineas couldn't help as his head followed the demon. He got into Phineas' face causing Phineas to lean back.
I am constantly trying to push your buttons
Throwing insults and many horrible taunts
I've made you scared and mad
And even really sad
And here's what I really want
Bill continued to float around Phineas, and he jabbed his stomach and pushed him around a little. Phineas waved his arms around in irritation to chase him off.
Unleash the shadow
Unleash the shadow
I'm not one to place the blame
Go and use it
Heck even abuse it
To waste the potential, such a shame!
Phineas looked down at his hands as a small black flame of energy started to form. Black circles started to form under his eyes as he stared. He shook his head, and he extinguished the flame. Bill was suddenly right by his side again, and he extended an arm around Phineas, resting it on his shoulder.
Call it what you want
It's just some extra power
Your emotions are so sour
Why hold it all inside, what a loss?
A chance like this won't come again
You'll regret not giving in
Isn't my anticipated defeat worth the cost?
Phineas backed away as Bill created an illusion of Phineas' shadow trying to grab him. Phineas looked around admittingly getting a little scared now.
Unleash the shadow
Unleash the shadow
We're not friends here after all
Your only interest
In this business
Is seeing my reign of terror fall
Looking down at the ground, Phineas held his hands out with a look of fear that it was going to be released. He didn't want to become The Shadow. He didn't want to let his dark side take over. He could see the small flame starting to form in his hands again as his inner rage toward Bill was overruling his fear. Bill put his hands on Phineas' shoulders, and he started pushing the inventor forward in that manipulative manner.
What I'm suggesting's very simple
And since it's win-win for your side
Why not just release
The darkness you keep inside
Think of your treasured family
You already possess so much
What the harm in taking your anger out
And increasing it just a touch
Phineas was pushed forward left alone in the space between him and Bill. He could see the black flame starting to grow now. The more it grew, the more intrigued he was by it.
Unleash the shadow
Unleash the shadow
This struggle's such a crime
But you can win it
If you begin it
Come on, kid! Don't fail me this time!
He stared at the flame as it just sat in his hands. Letting the darkness take over for just a little bit wouldn't be so bad would it? He'd be rid of Bill.
Imagine how I'll feel by setting it free
Indeed, he'd be more relieved if he just let it out. It was eating him inside.
This darkness from inside of me
Curiosity compelled him as he stared at the little flame. What powers would he unlock by giving into the darkness?
And what powers I'll unlock if I use 'em
Honestly though, Phineas just wanted to be rid of Bill, everything else would be just a bonus.
But the demon's demise is what I want to see
Phineas rose and extended his arms, so the flame started to grow, and he could feel darkness clouding over him. He wasn't going to fight it anymore. He just glared as the flame grew, and The Shadow got stronger.
Unleash the shadow
Free the shadow
NOW!
Bill cackled as Phineas' eyes turned from dark, deep blue to a sickly, menacing green.
So...hope you liked it. Leave me a review and
Bill: Remember! Reality is an illusion and the universe is just a hologram. Buy gold, BYE!
Phineas: Carpe Diem everyone!