A/N: I decided to make a last minute change to your weapon form in this story.
It is late at night as a woman is on her way home. However, she is attacked by a horrific abomination. A demon. The creature has a scythe on its arm and it gets ready to kill when suddenly...
???: *Whistles*
It turns and the woman runs. The monster sees the two of you and snarls.
Allison: A Demon. He cannot be allowed to live. Y/N, ready?
Y/N: You know it. Gotta admit. This guy's kinda like me. A weapon. But I'm way better because I don't lose my humanity.
Your arm turns into a long chain sword blade.
Y/N: Time to take his soul!
You turn into a chain sword and Allison wields you, ready to battle.
Allison: Head Hunter, you have let madness take over your mind. In the name of Lord Death, you shall die here!
The demon lunges at the two of you but with a flick of her wrist, your blade cuts through the creatures scythe arm and reels back for her to impale the creature. It turns into black energy and implodes into a red orb, a Keshin Egg Soul. You turn back into your human form and eat the soul.
Y/N: Thanks for the meal.
Allison: And that is our 99th Soul.
Y/N: Now all I need is a witch's soul and I can finally become one of Lord Death's weapons.
Allison goes to a window and blows on it and writes with her finger, using the way to contact Death.
Allison: Lord Death? It's Meister Allison York and Y/N L/N.
Death: Yes. Yes. How are you two?
Y/N: We just got our 99th Keshin Soul. There any Witches near us?
Death: Hm... I do believe there is a witch east of where you are but I think Maka and Soul are already on the case.
Y/N: Then we'll make sure we kill the witch first.
You and Soul have always had a competitive streak against each other ever since you met. However, unlike Soul...
Spirit: Ah if it isn't my future son-in-law!
Maka's father, Spirit Albarn is dead set on having you and Maka get married in the future.
Y/N: Mr. Albarn. I told you countless times... I don't think you should choose Maka's future love.
Death gives Spirit a Reaper Chop and the communication ends.
Y/N: You ready to go Witch Hunting?
Allison: Yes. Let us go.
The two of you walk off and eventually arrive at a pumpkin shaped house.
Allison: How do we approach this?
You turn your arm into a chain sword blade and use it as a grappling hook and launch yourself into a window only to find...
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Y/N: The hell?!
You land face first into the woman's cleavage and get a nosebleed.
Woman: You okay?
Allison comes in, somewhat angry.
Allison: This is what happens when you don't plan ahead. Anyway. Prepare to die, Witch!
Woman: Um... I hate to break it to you... I'm not a witch.
She takes off her hat and the two of you see a pair of cat ears.
Blair: I'm Blair. I'm just a cat with a lot of magic.
Y/N: Um... Maybe we should believe her. If she's right and we kill her anyway, we'll lose all the souls we've collected.
Allison: Very well... We'll give you the benefit of the doubt.
Blair: Awesome. And feel free to stop by anytime, cutie.
She shoves your head in her chest again but Allison drags you off.
Later...
Allison: Should we tell Maka and Soul about her?
You think for a minute and remember the time Soul replaced your conditioner with pink hair dye.
