A fesin was, in Orion culture, a training house for Orion slave girls, called lodubyaln. The word "fesin" literally meant "hutches" in the Orion language.
A fesin was dedicated solely to training and teaching the skills of the lodubyal. Girls as young as five were enrolled in these schools, and the majority of slave girls were a product of them. Senior and retired lodubyal taught and cared for these girls. (FASA RPG - The Orions module: Book of Deep Knowledge)