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So you wanted your boyfriend to be a demon in the sheets? Give your hole a real devil of a time? Well you weren’t expecting that spell you read to take itself so literally, in any case. You cast it on him, and before you even really had time to register what had happened, the fiery portal had opened up behind him, and the hands–or maybe claws and hooves would be a better word for what you saw–grabbed him and dragged him back inside, and it closed up again, your boyfriend gone, aside from the scorch marks on the carpet where he’d stood a second before.
You didn’t know what to do, but you certainly weren’t going to try casting another spell from that book. It was easy enough to cover his disappearance in the meantime–telling your friends the two of you had had a big fight, he’d left afterward, and you hadn’t seen him since. It was three full days later, and you had assumed he would be gone forever, when the portal opened back up again in your bedroom, while you were getting ready for bed, and your boyfriend stepped back out of it–only he wasn’t the same person he’d been before, and he also wasn’t alone.
He wasn’t human anymore–he was horned, his eyes burning like coals, feet and hands contorted into claws and hooves–just like the other two demons who followed him through the portal into the room. The three beasts pinned you down and started raping you, ravaging you with their massive cocks until you were exhausted, too tired to fight them, and they dragged you through the portal with them.
The police investigated later, but neither of you ever appeared again in this world–but why would you? Your boyfriend, now the rough, sexual demon, and you, his subservient worm sex slave. You’re both much happier now, I can imagine–and now, the book moves to another owner, someone else who desires power, but doesn’t quite know what they will give up to receive it.