I don't know how this story will end up , i marked two content warning but maybe i will mark the other 2 as well . 

It is a short prologue but prologue don't have to be that long . 

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In a city somewhere in the world , a white haired old man caressed his pet in his mansion . The pet crouched on all fours while wearing an iron collar .

After caressing it for a while , the old man commanded : " Come sit on my laps . "

The pet crawled towards the old man and did as the man commanded .

Blood dripped on the ground while the pet moved up and down . Two soft mountains movedon the pets body .

Grabbing one of the mountains the old man praised : " Truly worth the price . "

After leaning back and looking at space he sighed .

He enjoyed the moment for a while .

While commanding the pet to hug him he stood up and walked down to his basement .

While walking one could hear the moaning of the pet .

What awaited him in the basement is circle full of complicated runes , emitting a mysterious aura . On each direction , east , west , north and south stands an iron pole with a naked woman binded on top of it .

The old man looked at his pet . He grabbed her nack and broke it .

Blood trickled down from her mouth while entering the cycle full of runes .

Soon the surrounding got filled with murderous and dark intent .

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Slowly but surely the poles on each direction sunk into the ground while the air in the basement grew heavier and heavier . Soon one could hear the cry and sobbing louds from the womans .

" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH ! GO AWAYYYA AAAA ! "

" Mother of all gods , please protect me- me ...... and may- y the dar--- dark looo--rd be banished ! "

In the end everything blurred while smoke gathered in the middle of the cycle .

" Kuukakakakakaakka , it has been so long since somebody summoned me ? What do you want ? Power ? Women ? Talent ? Riches ? Give me more sacrifices and i can give you everything you desire ! " a deep voice sounded through the basement .

" What i want , is that you send my ______ from now into my 10 year old body from the past . "

" Then give me more sacrifices ! I can give you every .......... ! "

" No , you once was a strong archdemon . Now you are a mere bug , I know in the last millenia nobody summoned you or sacrificed anything to you . If you don't accept my demand , I will take back my four sacrifices . If you don't do what i say , you cease to exist in a few days to weeks . "

" KUKAKAKAKAKAKAKAK ! YOU DARE TO THREATEN ME ? I A THE GREAT DEMON ******** AM A MERE BUG ? AS I SEE YOU WILL DIE SOON , MAYBE ONE YEAR OR TWO ? I LIVED FOR COUNTLESS YEARS . EVEN THE ANCIENTS BOWED TOWARDS ME ! " the deep voice growled with anger .

" So what ? I already lived for 500 years . Compared to you it may seem small . However you will cease to exist in this moment and the only one who can rescue you is me . Everybody already forget your name , your existence . I will die , that is true . But people die every single day .

People way stronger than me get killed like annoying flies . Do you think i will lose in this trade ?

No , I ask you again , do you accept my contract and send me back to time ? Or do you want me and you to die ? I know time time traveling will cost you your entire power . But I will add in the contract that i will sacrifice 100 human beings to you . Do you want to sign the contract ? Yes or no , this is your last chance . " said the old man calmly while holding a floating piece of paper in his hands .

" MAKE IT 1000 HUMAN SOULS ! AND YOU SHALL SACRIFICE IT EVERY SINGLE YEAR ! "

shouted the voice , causing the basement to vibrate .

The old man scrimbled something on his floating paper while turning . " Sign now . "

Just at this moment the smoke appeared in front of the contract agreeing to it .

The old man laughed inwardly . Every beings doesn't wants to die , especially those who neared the end of their life span . They are greedy for every single chance to survive . Demons are only one example .

Grinning he could only see the ground coming closer and closer , in the end his face smashed the ground . Blood dripped out of his nose and he lost conciouness while grinning .