Reincarnated in another world as a great one

A promise

"Well that's the most work I've ever done instead of just hunting down monsters"I say while staring at what looks like a mansion.
"Know that I think I about,onee-chan what did you eat when you were living in the forest."
"Uhmm monster meat why?" I answer my adorable self proclaimed little sister.
"But isn't monster meat supposed to be dangerous for humans?"I pause before questioning Tiamat.
"What do you mean it's poisonous for humans"
"Well I heard from a few dragons that monster meat is supposed to be dangerous for humans so how come you are fine onee-chan?"
'Waits if it's poisonous then how come ohh I'm a great one...then shouldn't it strengthen my body or is it because I'm a being that exceeds monsters if that's the case then shouldn't they at least give me stats 'ping' hmm? 'status'
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Nyarlathotep:it should have mutated your body and given you stats but I alters you're physiology a bit so you don't become like a certain white hair eyepatch demon king.
and yes he's real it's a wide multiverse after all.
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"Huh so the arifureta verse is real huh?neat"well If he's real then I guess he won't mind if I burrow his fashion sense"
"Onee-chan what's arifureta verse and you haven't answered my question"as Tiamat says that I immediately respond the only way I know.
" well my precious little sister don't think to much of what I said and as for your question, would you believe if i was the niece of Lucifer himself"I see her going into a thinking pose before she asks a different question.
"Uhmm know i think about it what's your name onee-chan"
"Lilith,Lilith Morningstar"I answer her as I began walking to the mansion otherwise known as my home before she stops and mutters something.
"Hmm onee-chan how come my status says Tiamat Morningstar"as Tiamat finishes saying that to me I immediately use appraisal.
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Name Tiamat Morningstar
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'Wait why does she have my family name....oh for fucks sake don't tell me its because I acknowledged her as my little sister"
"Hmmm probably because I accepted you as my little sister,kind of how you keep calling me older sister"as I say that I see her tear up .
"Onee-chan I wuv you!!!"she runs up to me and hugs me while saying she loves me.
" I love you to"
"Hic really hic"
"Yes I love you"as I say those words she starts hugging me even tighter.
"There there stop crying"I say while patting her head while questioning if she's been alone for a long time 'well six thousand plus years is a lot of time especially when your alone'im snapped out of my thoughts as Tiamat finishes crying.
"But you know onee-chan we might be targeted for having the family name of Lucifer"I freeze before asking her why we might be targeted.
"Hmm why will we be targeted my cute little sister"
"Because the Morningstar name has a lot of power and if people know we held them as our family name then we will be hunted down or worse be sold to slavery,but they won't be able to catch me but what about you onee-chan"
"Then I'll just have to get stronger to the point where they don't even dare to think of hunting me down"i reply to her with confidence in my voice 'but she is right though as I am know I'm very easy to be hunted down by those that are my uncles enemies or because I have the family name of one the seven kings of hell,yea I'm fucked if I don't get strong enough to the point where even a mention of my name will cause fear into those that even hope to challenge me' as I was thinking  I asked my little sister something that will change my live.
"Tiamat can you promise me one thing"
"Hmm sure but what is it that you want me to promise onee-chan?"i take a deep breath before saying those words.
"Can you promise you won't ever leave me and that you'll always be by my side"
"I promise I won't ever leave you and I'll always be by your side"
"Promise"
"I promise I won't ever leave your side onee-chan"
As she says those words i sigh in relief while thinking that I'm a very possessive person.
"But why were you making me promise that onee-chan"
"Don't think to much into it,know then shall we go inside our home.
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In a throne like room a beautiful women with lustrous black hair that reaches her slim waist with breast that are not to big but not to small,with crimson red eyes that look like they can pierce your soul,while wearing a jet black dress that sparkles like the stars,this beautiful women is of course Nyarlathotep one of the most powerful outer god.
"Will you stop monologing what I'm doing every time you get here you sound like my narrator"
"Well its a habit that I've grown use to doing"
"That does not sound like you Cthulhu"
"What do you mean it does not sound like me, I'm pretty sure one of my alias is know as the high priest of the great old ones"
"Yeah yeah so what are you here for you don't normally come to me due to how the relationship between the outer gods and the great ones is"
"That is true but should you be playing around"
"Hmm oh that well Azazoth hasn't requested anything for me to do and is just busy napping"
"Well I'll guess I'll tell you well I have a request"
"Pffff I can't believe it Cuthulu the priest of the great old ones is actually requesting something from me who is know as the crawling chaos but on a serious note what do you need from me"
"Well umm you know how you reincarnated a human into world of your choosing"
"Yes I did that but that doesn't explain why you need my help"
"Well I just so happen to find a person that dared to make fun of me"
"Oh is it umm what's her name"
"Mio, Mio Takamiaya"
"Yeah that one girl from date a live so what do you want to do with her"
"Well can you reincarnate her as Liliths sex slave"
"Interesting but why"
"For shits and giggles and anybody that peaks your interest must have a few twisted fetishes"
"Well I can do that but I need to create a scenario where they meet and she becomes her sex slave but why would you specify it like that"
"Well let's just say I want to see her in despair and as a gift to new great one"
"Hmm makes sense considering I have two of them lying around as my maids"
"Thanks ohh is it possible for me to communicate with Lilith"
"I could make that happen since the worlds under my rule but what are you gonna do"
"I'm gonna give her this"
"Cthulhu is that what I think it is"
"Yup but I'm gonna need you to modify it so it works for her"
"You do know a few great ones are worried about your obsession with blood borne right"
"It's fine and anyways can you do this for me pretty please"
"Yea I guess it will be fun seeing her reaction well consider it done now leave the others will get wrong ideas about us meeting each other"
"Thank you and good bye"
"Well this should spice up the game board a bit"as she says those words she starts laughing at the idea of what's to come.
"Ohh just leave already!"