During an escapade in which he had taken the form of a mare, Loki was impregnated by a stallion called Svadilfari. Some time later, Loki birthed Sleipnir, the eight-legged horse, who was to become Odin's favorite mount.

Does Loki slept with SIF?

Conversation. 'Loki' composer, Natalie Holt confirms that Loki and Lady Sif slept together prior to the loop scene in Episode 4.

Did Loki give birth to a serpent?

Who are Loki's offspring? With the female giant Angerboda (Angrboda: “Distress Bringer”), Loki produced the progeny Hel, the goddess of death; Jörmungand, the serpent that surrounds the world; and Fenrir (Fenrisúlfr), the wolf. Loki is also credited with giving birth to Sleipnir, Odin's eight-legged horse.