Project Hivemind - Release 2.2 by Karatus - Adult Sex Game

Project Hivemind is an adult interactive fiction game where you play as a lab-grown parasite that escapes a research facility. Infest new hosts, unlock skills and acquire power while trying to build a solid nest while trying not to draw too much attention
Obeserve, control and manipulate the actions of your targets and try to harvest as much biomass as possible to grow and become more powerful.

Strangely it seems that sexual acts between humans yield the most gains for your growth strategy​