Q: "can you not?"
Q: "is this a shitpost?"
A: "kind of but its also legit"
[Displayed: Sayaad mid-interrogation with victim]
Sayaads and You
so this post is a thing because there's a shocking number of roleplayers out there who have this mindset that succubi are these friendly more "human" demons who can be good people and just want to live normal lives and escape the mean legion and be friendly!!! It's gotten to the point where I've literally once had someone who was new to the server whispering me telling me that their friend told them that Sayaad were such a way and they were just confused in playing the role. I've as well seen warlocks protect their sayaad minions as if they were truly good friends, which, is extremely detestable given how insanely messed up Sayaads are in the lore. While I'm aware a majority of these characters are ERP bait and don't really care about lore or playing properly, I thought this would be a good thing to make and refer to. I don't play one, despite the fact that they're pretty nifty in terms of demons, beyond dming one for my warlock char, but I still felt it would be a good idea to RAISE AWARENESS with this post. If I mention something inaccurately, or there's something you feel should be added, just let me know honestly.
I'm gonna start this off with a quote from the Hologram Emitters located in the Exodar that give information on various demons. This is how they describe Sayaads:
"The cruel sayaadi temptresses exemplify the subtler side of the Legion's nihilistic crusade.
They revel in causing anguish and pain - and their murderous interrogations are the stuff of nightmares." 
I'm going to as well add to this a quote from the Timewalkers, featured in their daily quest that asks players to answer lore-based questions:
Sayaad are not friendly, mortal-like, sexual "human" demons by any league, and their purpose is not merely to be footsoldiers or random members of the legion, it's more specific than that. From the quote, two things are almost immediately evident:
1) Sayaad are extremely fucked in the head and by no means "human-like" in the sense that they derive enjoyment and ecstasy from the suffering of others, usually inflicted by themselves.
2) Sayaad serve a specific role in the legion as interrogators. This shows inherently that they're pretty important in the grand scheme of things, and are generally some of the more loyal demons if they're going to be torturing others for information that would benefit the legion. They've seen the worst of what the legion does, and given point 1 above, they enjoy it and are mostly the cause of it.
The notion that sayaad are nice people should be out of your head from that alone.
Moving ahead I'm going to talk about a quest that stood out to me in the recent expansion Warlords of Draenor :
In the quest, you seek out a Sayaad hidden in a cave, and defeat them, however, the notable thing about this quest is that you find a book the sayaad was working on, which was in part a journal and in part a tome of curse spells and spells of demonic empowerment designed particularly towards the aim of empowering and imbuing weapons with fel magic to trap souls. So that's fine, the thing that stood out though, was that the book was made of sewn together skin and flesh from victims, something that could be assumed as common and enjoyable among the demons. Given the nature of their "nightmarish interrogations" as described above, it's likely that the book was made during one of such things, perhaps as a form of pain-inducing torture. However, it's important to note that this craft of making things out of the flesh of victims isn't limited to books. They even make whips out of flesh, and no doubt other things as well . It seems to be a common trend.
Next will be to mention the warlock quests from vanilla that detail the binding rituals for a Sayaad, and in a way, describe their fantasy:
"You will learn to summon a succubus, a creature of incredible mental powers. It can lull those of weak minds into its servitude" 
"A succubus is a devourer of souls, destroyer of hearts, and dominator of minds. It knows nothing but evil." 
These quests display two things of import about Sayaad:
1) They have abilities over the minds of others, and are able to bend wills to their own. We can see from the style of how the game mechanics works this is likely done with entrancing a foe into a pure mindless lust that cripples them into being useless to the Sayaad. This is likely used in interrogations for getting the information they want. There is no source that points to this ability being ever used to actually engage in sexual activity, and it is only referenced when speaking about their dark abilities to twist minds.
2) Succubi are 'devourers of souls', and 'know nothing but evil'. These two facts speak largely to the general personality archetype a Sayaad should try to stay within. They're demons, and are prone to destroy a person in body and mind, and well, as the title would suggest, devour their soul after the fact for their own power. They are not simple sex-dolls.
On the topic of loyalty:
We've been shown that some sayaads are actually ascended from mortals with a desire to serve the burning legion as a gift  rather than being natural born, showing just how fierce the loyalty of these demons truly is.
When a demon is binded, it does not cease to become evil. We see, not with Sayaads specifically, but even with a more powerful set of demons, the Eredar Twins, in the warlock storyline in Legion, that when a demon is binded they retain their evil and suffering-inducing tendencies but merely serve their master completely in doing them. It is not a struggle of wills, but instead a total dominion of "I serve [master], and will do what they say" and truly meaning it. The Eredar twins, even in being binded are no less sadistic in nature or quotes .
This all in all means, that even if your demon is bound to a warlock, they do not suddenly lose all traits of being a demon. They do not become a nice person. They do not become more mortal. They simply change which side they perform their evil tendencies for.
A bound Sayaad actually is shown on the broken shore as Tehd Shoemaker's minion. Some of her quotes are interesting. As a bound demon she displays hatred for the legion but a continued will to inflict suffering on others. 
- "It is as if these demons can't handle a bit of whip..."
- "Tehd promised we could burn this place to ash."
- "My "master" ordered me to help you, so try not to die."
and finally some fun trivia, sayaad wear skimpy close-fitting clothes because they're trying to beat the heat on pretty intense hellish legion worlds that are mostly fire , not because they're trying to get banged.
Q: "should i defend a sayaad if they get attacked, since they're pretty much just people"
Q: "what if they're bound to a warlock"
A: "still no"
Q: "can i erp with my sayaad"
A: "please dont"
Q: "sayaads exist for only erp right"
Q: "sorry im not really sure what this is"
A: "me either"
Q: "should i be close friends with my sayaad"
Q: "if a demon hunter kills a sayaad i should kill them for murdering an innocent right"
Q: "sayaad have a full range of emotions and are friendly to people right"
Q: "did something happen to you in public rp to make you post this"
A: "moreso a lot of things over the span of a long time that never seemed to get better"