Tentacle Invader

Story

A 4th dimension creature invaded Earth quietly one day. Soon, it assaulted multiple people and used them as breeding chambers to multiply. When humans became aware, it's too late to stop them. The 4D organisms has intelligence and social concepts. They communicate by invisible waves. Their natures are only three things: hunger, greed, reproduction. They can deceive, escape, invade and plan attacks. The original organism is planning to enslave the entire human being to become their slaves before revealing itself and reconstruct the planet hierarchy. All cities have been infected at this point.

Traits

They are invisible to 3D organisms. Only when they inject their hormone, which include unknown properties, hallucinogens and stimulants compounds, that the infected individuals may see their physical shapes. They are tentacles like creatures with no facial body parts. There are 4 kinds of tentacles that somehow similar to Earth's creatures: insecta, mollucsa, plantae, slime. Their body are resilient with 80% water. They are colorful. They evolve into the most bizarre but efficient shapes to create pleasure for their preys. They have 2 sources of food: body fluids (but they cannot consume a lot of blood so they'll rather get arousal fluids) is food for their physical forms, and emotions are food for their spiritual forms. All of them can impregnate 3D living organisms. They lay a dozen eggs that feed on the mother fluids every couple days. Human is their favourite prey because human produce more intense spiritual food than any other creatures. Tentacle offsprings will mature in 3 months, during the time they parasite inside the impregnated organism, they will produce compounds that transform the mother's body into their ideal breeding chamber: induce breats grow hormone, lactation, build functional uterus in male organisms and make the rectum breedable. They also make the human digestive system more reliable on liquid nutritions than hard food. Infected individuals will have their psychology twisted, they become more animalistic and cannot resist the lust.