In a nightmare, a siren had the brilliant idea to create a foal. He collected a vial each of his own and his partner’s semen and used them with a dark magic spell. He performed this ritual in the basement where a demon was summoned and then bound together with the specimen vials into an innocuous looking egg.

Using what knowledge the siren had of hatching eggs, he took the egg to the closest source of water, the bathroom. After preparing a shower he brought the egg under the running water, held it close to his body, sang to it, and waited. With the combination of his body heat and the water, a few hours later the egg successfully hatched.

Although the hatchling is a demon, he is physically a hybrid of a siren and an earth pony, and as a result, he’s mostly pony shaped, but has a lot of siren traits: tail, fins, fangs, scales, gills, a love of water, and a carnivorous diet. He can shapeshift between a foal and a siren baby, via a necklace he was wearing when he hatched; however, shapeshifting does not affect his size. The foal appears to have inherited much of his colours from his ‘parents’, but other family member’s colours show too.

In the morning, the siren woke up his partner, a zombie, and revealed to him the result of his dark magic spell. Naturally, his partner was furious, because he didn’t consent to a foal, especially one forged from the two stallions. After he explained the process, the zombie panicked because anything less than filicide would be useless. He was stuck with this newborn demon foal.