Let's start
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Your POV

I

t was 2 days since Rias' peerage met Riser Phenex. You trained a bit and gained two abilities
1. You can send so much demonic energy into someone that that person goes unconscious
2. You can merge your armor and weapons

(It can shoot bullets from the hands)
You and the occult club were in the clubroom. Suddenly someone knocked at the door you answered it
???: I was sent by Riser
You: sure come in for a cup of tea. Btw I don't think I have your name
Ravel: I'm Ravel Riser's sister
You : nice to meet you I'm (Y/N)
You and Ravel went into the meeting room . She introduced herself everybody else went out to leave you for business. You made tea for the two of you
Ravel:*takes a sip* this is good tea
You:wait I think we have some cookies in the kitchen, I'll go grab them
Ravel:okay
While you were gone Ravel put a weakening poison into your tea. You got back
You:here have one
Ravel:*eats cookie* these are very good
You: thanks made them myself
(In mind) your tea has a poison made from my soul inside it
You(in mind) :can you absorb it?
Yea but you need to drink it
You drank the tea and felt weak at first but shortly after even stronger
Ravel: so Riser set it up to be tomorrow at 12 o'clock
You :where?
Ravel: in hell
You :OK
Ravel: oh I must get going now
You : wait a second please
You went into kitchen and got a lunchbox put the remaining cookies into it and went back up
You: here take the rest with you
Ravel: do your friends not like them
You: no they do like them. I'll just make more . Oh and share with the rest of the peerage please. Don't worry they're not poisoned*grabs one and eats it* see
Ravel: on thank you see you at the battlefield
Ravel left you asked hexas in your mind: so what can I do now With the new pieces of your soul? And how many do I have in total now?
You can make your enemies weaker. You have 120 pieces of my soul 70 from hexas Gears 10  for each of the swords and the shield and 20 from the poison he really wanted to weaken you
You: nice
After your little conversation with Ravel you told the occult club what happened and made some more cookies.
Rias: *eats a cookie* good as ever my cute little pawn
You blush a bit
Tiana:*eats one too* very good... Baka
Akeno: *eats a cookie* very good~
Kana: c-could you teach me how these delicious cookies are made*eats one in little bites*
You:sure
Koneko eats one and has stars in her eyes, she has a small smile on her face as she eats one , which surprises everyone in the room
Koneko grabs out to reach the last cookie as does everyone else but kiba was faster and eats it
Kiba: really good (Y/N)
Everyone: please make more
You: nope~
Koneko hugs you and gives you kitty eyes: pwease (Y/N)
Everyone is surprised at koneko's display of cuteness
You: OK I can't resist those eyes, but we need more sugar flour and chocolate along with baking powder,milk,eggs...
Rias let's an magical circle appear in front of her says something and hovers it in front of you
Rias: name  the ingredients
Soon after you named them another magical circle appeared in the storage room and it was full of the needed ingredients. After making a ton (weight) if cookies you put some inside a backpack and left the rest for death by devouring.

To be continued...