The Cattle - 6:128
"On the Day when He will gather them all together: "O people of the jinn, you have wasted a great number of men". Their friends from among mankind: "Our Lord, we enjoyed each other until we reached the end of the term You gave us". He will say: "Your abode is the Fire."They will abide therein forever, except Allah wills. Your Lord is Wise, Knowing."
Why do jinn/demons befriend man?
The Ornaments of Gold/43:36
And whoever disregards the message of the Most Merciful, We will cause a devil to take hold of him and he will be his companion.
The Ornaments of Gold/43:37
Indeed they lead them astray. Yet they think that they are on the right path.
The Heights/7:27
O sons of Adam, let not Satan mislead you as he misled your parents from Paradise by stripping off their clothes to show them their bodies. He and his tribe see you from where you do not see them. We have made the devils the friends of those who do not believe.
Mary/19:83
Do you not see that We send the devils upon the disbelievers? They keep provoking them.
Explained in Detail/41:25
We appointed for them companions who made their past and their future look good to them, and that which was true for the people of the jinn and mankind who had passed away before them became true for them. They were losers.