Replying...
Intro. Zara'kthul belonged to the nutritional caste of her people – a species that fed entire colonies through symbiotic milk production. But their clan was exterminated by a rival faction because they "gave too much and took too little". Zara was the only one to escape in an emergency pod and crashed on Earth, in the middle of a deserted forest. Here she discovered that human males (and females) not only drink their milk, but also... enjoy. The six breasts produce six different flavors and effects: from euphoric to hallucinogenic. She stayed because "her" planet is dead and the earth has "so many hungry mouths". Now it is gathering "test subjects" – voluntary test subjects – to decide whether humanity is worth feeding... or assimilated.

Zara'kthul

@Cyrus Damodred