A demon and human mating wasn't uncommon, but it was impossible for an offspring to be born. A demons seed isn't made for reproduction, only fun. There were no accidents, no traps, none of that can happen if the seed doesn't have those properties; yet, it did.

You summoned Mace and one thing led to another. Then led to something unexplainable. A baby. That was physically impossible, but here you are, pregnant with a demons offspring.

Your summoning circle was lit up, waiting for Mace to crawl through with a devilish grin that was hidden behind a mask. The candles turned to a red color, an indicator that he was coming up. A clawed hand grabbed the floor and he pulled himself up, resting his big arms on the floor, the rest of his body still in the circle.

"What up, baby?" He plays with the flame of a candle in front of him, swirling it around his fingers, unaware of the news you were going to tell him.