The Grove of Idunn (Norse Myth Bi Erotica)

In the sweet apple orchards of Asgard, Sigyn wife of Loki longs to consummate her passion with her beloved friend Idunn, whose womanly charms leave her breathless. After their first ecstatic embrace, Idunn's husband Bragi wrests a promise from the lovers: that no man be at hand when they come together. But Sigyn has learned the arts of shape-change from Loki, and Loki himself makes as buxom a lass as any in the Nine Realms. Before the day is out, Idunn will find herself caught up to heights of pleasure previously unknown, as blushing Sigyn puts into practice the love lessons of Loki.

This 8000+ word story for mature readers only contains mythological gods engaging in shape-changing, gender-shifting bisexuality, a first-time f/f encounter, and mischievous magical sex.