Simon whooped in jubilation as the pentagram blazed with eldritch black fire as thick black smoke swirled and coalesced inside, forming a large, looming figure of dread.

"WHO DARES SUMMON ME...?"

It roared, it's voice a cacophony of thousands of battlefield curses and cries of treachery.

"I do...!"

The voice that replied was reedy, nasal and dripped with smug satisfaction.

"My name is Simon, and now that I have summoned you, I compel you to do my bidding. I have a grimoire here with the names of all who have wronged me, that you must eliminate"

With that, he held up a cheap school notebook. The creature in the circle seemed to be glancing around the room, taking everything in; before chuckling with menace.

"And prey-tell-me... Simon, with your repurposed schoolbook, dollar-store dribbly candles and..."

It's voice pitched in disbelief

"A Youtube video loop of creepy chanting?"

It shook its now-solid horned head

"How could a pathetic snivelling worm like you find the hundred victims needed to summon me?"

Simon grinned, not only would he show his classmates, but this arrogant Demon too that HE was truly a master of reality. He held up a petri dish in one hand and a spray-bottle of antibacterial solution in the other.

"It was never stated that the victims must be human to summon you"

The Demon laughed as it stepped OUT of the circle, its cloven hoof leaving a scorch-mark on the floor.

"To summon me, that is true"

It tore Simon's still-beating heart from his chest and held it to him.

"But to BIND me... Now that is another matter entirely"