Evil idea strikes again

Hello guys, I'm here to tell something that has been bothering me (like everything does), so, I'm looking for advice (or something like that, Idk).

Days ago, I only planned in actualizing 'Whispers of the Past', because it was the only story I have set a (how I say this??) base. But then, oh epiphany! I wrote 'Moonlight' just because I could. And then... you guys appeared. No, I'm not scorning you, it just feels different.
So I thought "Oh well, then let's write the two, duh," but then... another idea appeared in my mind. Well, you know that I tend to write stories with an original concept (that is the reason why I write them) or stories which argument is one rarely used. So... I think this argument is gonna kill you *takes a deep breath*

OK SO TWILIGHT MESS A TRANSFORMATION SPELL AND ACCIDENTALLY THE SPELL HITS THAT SCEPTER WITH HER HEAD AND THEN SHE STARTS TO TRANSFORM IN THE SCEPTER LIKE HAVING HER FLESH CONVERTED INTO GOLD AND THAT KIND OF THINGS.

Why did I think of something like that? Well, I was 'lol'ing in the Internet and this image appeared.

And I thought "Lol I can make a story out of that." Yeah I'm Satan I don't need you spitting it in my face. And, if someone asks "Lol do you really like to transform Twilight into things do you?" the answer would be "yeah, a hella."

Okey guys, what dah ya think? Because I don't want to be that kind of writer that makes like fifty stories but doesn't end any of them. Worse, I really want to make this story because it seems really original to me and I want to know how it can turns out, seriously, writing it would be really funny for me.