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Ren hasn't been a practitioner of the Dark Arts for long so he's unfamiliar with demonic summonings, that's how he messed up his spell and has gotten himself into this situation. In the beginning he did his best to struggle against these imps but it was no use. He was outnumbered by these entities and the tentacles that arose from the portal he opened.
As he surrendered his body, he felt a sense of relief and a wave of pleasure. He could properly enjoy the demons fucking him. The engorged pole thrusting into his hole made him quiver and moan with ecstasy. It filled him with heat and corruption. Oh hell, it was one of the best feelings he's experienced.
While he was being screwed, his mouth was being used by one of the others. His mouth was soon filled with demonic seed, a drink he's never swallowed before, the taste will be one that he'll grow addicted to. Another imp that was wrapped around the boy's leg was busy squeezing and rubbing his nipples. The deranged act of this human teen and demons fucking just fucked up the boy's mind.
When Ren comes, he will forfeit his soul.
It doesn't matter as he won't give a fuck! He's happily enjoying sex with these creatures and even if he gets dragged into Hell, he'll just enjoy the ride!