Adult PC Game: The Thing That Came From Space v0.3.2 by Ethernet Plague Archive

An alien shapeshifter finds itself on an eerily Earth-like world, surrounded by powerful threats and beautiful women,
and in possession of an insatiable libido.

Take control of a parasitic shapeshifter, acquire a variety of useful forms, and use those forms to have impress your lust upon the many fine ladies you happen upon.​

The Thing That Came From Space v0.3.2 by Ethernet Plague Gameplay Preview