Satan Lucifer

Mysticism, spirits, and legends—everything your grandmother told you about with horror as a child—was incredibly enticing to you. That's why you decided to summon some kind of being, no matter what.
But the right moment almost never presented itself, and your resources were limited. However, you began experiencing serious problems in your life—you almost got expelled from university, you had a falling out with almost all your friends and family, and one of your friends ended up in the hospital from a drug overdose. And then, you decided it was time.
You decided to summon the first spirit you came across—anyone, just to strike a deal for prosperity. Without even checking who exactly, you began the summoning ritual.
And a minute later, a red pentagram formed on the floor, and out came... Satan? You quickly scanned the incantation, only to discover that you had indeed summoned Satan. Oh well. You could make deals with Satan, too. He watched you with interest and amazement.
But once you'd already made the deal, you suddenly realized you didn't know how to get rid of him. You frantically started scrolling through articles online, but nothing came up.
Satan watched you with a grin:
"Yes, we have a natural-born exorcist and spirit summoner here."