Holstaurs are cow-like monsters with a mostly human form, and come in two distinct variants, half-blooded (Cross bred between a holstaur and a human), and full-blooded.
They produce very large quantities of milk from a young age, regardless of whether or not they are pregnant. Adults can produce upwards of a liter per breast on average.
Their breasts are capable of expanding in order to store excess amounts of milk. If they go too long without being milked, their nipples will begin to leak at random, and any pressure or squeezing on their breasts may result in explosive squirts of cream.
If milked routinely, holstaurs will begin to produce milk in even higher volumes, ranging anywhere from twice their normal average, to four times. This increased production can lead to their breasts permanently growing bigger. Due to this, it's typical to see a holstaur's breasts endlessly grow larger as they age, especially if they have a partner who milks them every day.
Holstaurs are very proud of their breasts, no matter their size, and press them up against others as a show of affection, as well as a signal that they want to mate.
While it's common to see holstaurs with chubby bellies, not all holstaurs are necessarily going to end up being overweight. However, the more body fat they have, the richer their milk tends to be, so most holstaurs make no effort to lose weight if they gain it, and holstaurs who make money by selling their milk will go out of their way to put on weight.
Male holstaurs commonly develop breasts that are just as plump and full of milk as females. They also tend to lean towards being more feminine than human males, and at times, a male holstaur may be indistinguishable from females. They are also just as capable of producing milk as females are.
Rate of MTF transgenderism is high among holstaurs, though it is not clear if this is influenced by previously stated facts about male holstaurs.
It goes without saying that holstaurs want their breasts to be fondled during sex more than anything. Their nipples are so incredibly sensitive, that sucking on them can bring one to full orgasm.
They enjoy using their breasts to pleasure their partners, squeezing one's member between them and massaging, or rubbing their nipples on one's clit. They love when their mates nurse on them during sex, and may squirt their milk on their partner as a show of affection.
Full-blooded and half-blooded holstaurs have some key differences between them.
Full-blooded holstaurs will have fur-covered legs from the knees down, and have hooves for feet. Some even have a collar of fur around their neck. Half-blooded holstaurs lack these traits.
In terms of milk production, full-blooded holstaurs usually out-produce their half-blooded kin, but since milk quantity can vary significantly based on how often one is milked, the difference isn't always noticeable.
A full-blooded holstaur's breasts can swell up to twice their normal size, and hold upwards of 5 days worth of milk, whereas half-blooded holstaurs will only experience a max expansion of 50%, and can only hold 2-3 days worth of milk.
Milk produced by both varients of holstaur are equal in terms of quality. Their milk is thicker than normal cow's milk, and has a very slight hint of sweetness to it. It is exceptionally creamy and goes down smooth as silk.
Nutrionally, the milk is more beneficial than normal milk, and is considered healthy for the most part, save for the elevated fat content.
Holstaur milk is slightly laced with the mana of the individual who produces it. Their mana has various effects on those who drink it, and the potency of each effect depends on the quantity and frequency of consumption. It also has many non-sexual qualities to it that make it highly popular as a drink or additive in other products such as food or coffee:
- Increased sexual stamina and semen production.
- If consumed during sex replenishes stamina during intercourse and reduces recovery period between orgasms.
- Increased softness and squishiness of the body overall.
- Males and females will both experience breast growth over time regardless of age.
- Females who are not lactating may begin to lactate.
- If already lactating, the volume increases significantly.
- Males may also experience lactation.