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Sebastian and Ciel’s Contract Isn't Fair: an explanation
(Includes spoilers for Ciel’s past)
This is going to be a short explanation, mainly because I don't think it should need a long one to understand this.
Anyway. I've seen people say that Sebastian and Ciel’s contract is fair and that Sebastian deserves to eat Ciel’s soul — this is completely wrong.
Their contract was never fair in the beginning. Let's backtrack to a few chapters before Sebastian and Ciel meet:
As we know, O!Ciel went through extreme trauma (including R!Ciel.) On his 10th birthday his parents, the house servants and his dog Sebastian all got killed. He saw their bodies.
Then shortly after he, along with his brother got kidnapped by a cult. This cult sa'ed/r-ped him and his brother, and also subjected them to other forms of torture and starvation.
And in chapter 136, R!Ciel got sacrificed and his soul eaten by who we soon know as Sebastian. O!Ciel witnessed all of this.
Mere moments later, Ciel meets Sebastian for the first time. Immediately, Sebastian manipulates Ciel into a contract. Just look at these few panels:




All of this is clear manipulation. I shouldn't need to explain this. The panel where Sebastian holds up R!Ciel’s body in front of O!Ciel speaks for itself.
Ciel had no choice in making the contract, it was either die or die. If he didn't make the contract he would've died by the cult, starvation, whatever.
The whole situation wasn't fair to Ciel at all. Ciel was already in a very, very horrible mental state. In only the past month he lost everything. His parents, his dog, his home, his brother, his innocence and a proper childhood. He is 10 years old when all of this happens.
He isn't in any position to make a contract with a who-knows-how-many-millenniums-old-demon at 10 years old and experienced all of this trauma already.
And after Ciel made the contract, Sebastian immediately started to try to deceive him. Here's a panel showing this:

I'm going to remind you again: Ciel is 10 years old when the contract was made. So, how is this fair? It isn't.
People say that Sebastian deserves to eat Ciel’s soul because of everything he has been assigned to. Although that's one of the likely endings to the story — it isn't deserved.
Basically everything that Sebastian has been doing in the contract, such as his assistance, will never be fully fair to Ciel.
Sebastian is a demon. Basically everything he has been assigned to has never been too much of an effort. It's probably annoying, yes. But he's still a demon who might be in the millenniums years old. He will eventually forget about Ciel after eating his soul, and none of it would really mean anything to him.
Like all demons, Sebastian doesn't care about fairness, he just wants a meal.