If it happened:
and...
These are the authors of Scandinavian mythology:

Discuss the Scandinavian mythology.
I: And here is the horse Sleipnir, eight-legged, what is it? Did he look like a spider?
Husband: No, since it was Loki’s horse, it was like a limousine.

Slepnir was the horse of Odin. Loki was the father of Sleepner.
--------
Not the father, but the mother. So it happened.