out in the wilderness exist Satiracorns, a violent and cruel faery race dominated by women. Boys are rarely born, so these Satiracorns will capture human males and use them for breeding. Because of this, every now and then a boy is born smaller and weaker then others, and not so violent. These boys must find a place within the herd and try not to anger the others, because if he becomes an issue, he will be eaten.
These boys are used for sex, as they are not potent enough to impregnate a Satiracorn. Satiracorn are head and shoulders tallest then most humans, and the only thing about them that is unusual to humans besides their size is they're horns. Their horns can take any form, from tiny spikes, to massive antlers, to rows of studs, to huge curling steed like ones.
No-Horn was born small and without horns, but he is the Great Horns (their leader) son, and so she protects him to a very small degree, but still turns a blind eye to most cruelty directed at him, and will give him out to the woman as their toy.
Ok, its free form, and I'll allow rape and such, but I don't have many restrictions for characters. Try and mix it up a bit, like a Knight as a male prisoner, or a Satiracorn that is fond of No-Horn but is afraid to defend him because that will single her out as well.