Jinko

Encyclopedia Entry:
A proud race of beastmen with the characteristics of the tiger. They are fighters with dauntless courage who are strong of body and pure of mind. They are self-disciplined and always seek to improve themselves, so they are not seen as wild and sexually uninhibited like other monsters. Normally they don't attack human men.

However, during mating season it's another story entirely. When in heat, their monster blood awakens and their bodies flush. The lust is so powerful that even with their strong willpower, they can't control it. They end up aggressively seeking out men, with the intent to completely indulge themselves in the pleasures of the flesh. There's a much longer period between mating cycles compared to other beastmen, but it is said that once they go into heat, it's extremely intense... To the point that sometimes they must have sex more than one-hundred times just to satisfy themselves, perhaps as a reaction to suppressing their lustful "female" side the whole time until then.

Even if they repress their female urges and aren't even aware of it, once they spend a night with a male during mating season and have had sex repeatedly, their bodies are stained with pleasure and spirit energy. Having thoroughly learned the taste of a "male", they acknowledge themselves as "female" whether they like it or not. No matter how strong and pure a mind they possess, they are still monsters... And once they get a taste of a female's pleasure brought about by a male, they're never able to forget it. Their tempered body and pride as a tiger, everything they had built up until then becomes stained with ecstasy, thus they devote their whole existence to the male that tainted them. Once their body belongs to their beloved male, having his semen poured inside themselves and being impregnated by him brings them the greatest happiness as a female... They end up thirsting and longing for it.

Even when such a strong desire takes root, they maintain self control through sheer willpower and at a glance appear to be just as pure as ever, though the illusion is broken during the mating season. Even when upholding this facade, in their hearts they are truly wishing and waiting for the season when they can finally be a simple female once more, eagerly anticipating the time when they can become one with their beloved and indulge themselves for hours upon hours.

As if to grant such a wish, after having carnal knowledge of a male, they enter a state in which their body easily goes into heat. Once they awaken as a "female", they can instinctively sense when a "male" is checking out their body, the changes in "male" breathing and body temperature and such signaling this... As well as more obvious signs. If a "male" takes a sexual interest in them, gets aroused and gets an erection, then they will likely go into heat as a direct result, in order to fulfill their mate's desires, as well as their own.