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I was looking around on Lexicanum, and I thought for a second after I read HH books. If the Emprah made a deal with the chaos gods, before making primarchs, then did the emperor make a deal with slaanesh? Not quite sure about the timing though. Here are the articles

we're not sure. in several horus heresy books however it's been implied the Emperor may have aquired power from all 4 deamon gods to produce the primarchs. some of the novels had the gods of chaos hint to various primarchs such as Horus and Lorgar that he made a deal with them. Spirit of vengence however suggests he may have actually tricked them and stolen the power. which is the ACTUAL reason they're backing Horus.

but so far basicly we just have the word of the chaos gods, not sure I'd call that reliable.

I think the first book also implied that the Emprah stole the power from chaos gods. I think only GW knows.

the primarchs are definitely warp entities house in flesh golems (i.e. what the dark mechanicus WISHES they could perfect). That much is certain. Whether he stole from the chaos gods, snatched a pre-existing warp entity, or what he did is unknown.

Whoops... there doesn't seem to be anything here.

Simple answer is no. Slaanesh was born after the Primarchs were created. Chaos Daemons codex timeline says so, and that's really the only bit of fluff that is ever canon anymore, right? But, making sense of what is canonical and what isn't is an effort in futility. Easier to just run with whatever is being said in the book that is currently being read.

How can that be right? Slaanesh was created at the fall of the Eldar and The Emperor created the Primarchs AFTER that happened.

Not according to the Daemons codex. Both events are listed. Creation of Primarchs M30, Fall of Eldar M30-31, Horus Heresy M31. Exact imperial dates aren't listed, but that is the order of the graphic in the codex.

No I agree that the chaos daemon codex is incorrect, it was the fall of the eldar that caused the dark age of technology as slaanesh's both caused warp storms all around the galaxy completely isolating each of mankind's planets thus the techno-barbarian age dawned. thus the emprah makes the primarchs with chaos energy fused with genetic engineering, loses the primarchs and makes the first space marines using just the genetic engineering parts. <enter: the great crusade>

As soon as Slaanesh was born, s/he had existed since the Dawn of Time.

The Chaos Gods are not bound by temporal linearity.

Slaanesh was born from he excessive emotions of the eldar race as they experimented with new forms of pleasure having reached the pinnacle of their society (basically pseudo dark eldar) once the enormous build up of pleasure/pain emotions coalesced slaanesh was born, after which the eldar split into two factions, the dark eldar that continued the practices of extreme pleasure and pain and the craftworld eldar who returned to their traditional values.

The Emperor definitely predicted the birth of slaanesh and the cessation of the galaxy wide warpstorms that came with it. Perfectly timed for the start of the great crusade

 Psienesis wrote:
As soon as Slaanesh was born, s/he had existed since the Dawn of Time.

The Chaos Gods are not bound by temporal linearity.

I was trying to put this in a post but gave up as I couldn't find words to explain, nice one

In real time/space we see the birth of Slaanesh as what caused the fall of the Eldar, but as Psienesis says, Slaanesh has always existed in the warp. Always and never ...

I remember somewhere saying that Khorne was born when the first ape/human smashed another's skull with a rock/bone. But as soon as that happened, Khorne existed in the past? This not being bound by time is kind of messing with me.
Oh yeah. Horrible joke incoming.

In vengeful spirit it speaks of how the emperor makes a deal with the gods after making the primarchs and how he "mind washes" his sons so they don't remember the entrance into the warp...

And Horus remembers and goes into the same gateway the emperor goes through and makes a deal with the gods as well.

i could say more but I don't want to ruin the book you should read the book it really shines light on how the emperor and Horus get so powerful..