The Artifact Part 1-3

A family of five (Son, older sister, younger sister, mom and dad) have just moved a small town.
The player stumbles upon an ancient artifact unexpectedly merging with it and freeing monsters in the world between worlds.
These monsters will stop at nothing until they destroy the artifact carrier and gain access to the real world.
The artifact has uncontrollable forces and at the same time feeds on sexual energy.
These forces can manifest themselves in the form of invisibility, enlargement of the penis, making people constantly excited, etc.
And even in the form of an exchange of bodies.
The player still needs to find a way to climb into the underpants of the entire female half of the family.