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=== Reproduction ===
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Like many reptilian-origin races, gryvain are infertile except in regular cycles of oestrus lasting about one month out of every year. Gryvain heat cycles are not tied to any particular seasonal or atmospheric condition, and each individual has a different time of the year she will go into heat. Notably, gryvain heat does not end after successful mating: the cycle lasts for the full month. During this period, the gryvain’s sex drive is markedly increased, and both her sexes are in a state of near-constant arousal, preventing her from easily hiding her state from others, and the sensitivity of her entire body increases dramatically. Simple acts such as brushing a tail or groping a breast or buttock can cause immediate ejaculation, and most gryvain at this point find it nearly impossible to resist offers for sex, especially to be bred.