Sandra

Introduced in Part 2, Sandra is the sister of the Player and Julie as well the daughter of Jessica. She can usually be found in Sandra's Room on the first floor of your home.

Once Sandra has been Infested you'll gain access to the Strip club.

Getting Mindfucked
If you get mindfucked by Sandra once a day by her alone the following events happen;
 * 1) You will let her use your anus in the morning. In the morning "You give your anus to Sandra's cock"
 * 2) You crave her touch - you want to carry her babies
 * 3) It seems dangerous to get mindfucked by Sandra again "You feel happy when thinking about Sandra's cock".
 * 4) Sandra Domination Victory

Bad end.
You feel calm.

Sandra has completely given in. She has embraced her slavery to sex and to the parasites. And she is your master.

You spend your days going to school, acting normal and standard, while simultaneously quivering in lust and desire. You think about Sandra all day, every day, waiting to get home so you can join her in hedonistic bliss. As the rest of the household succumbs to Sandra, it turns into a never-ending orgy from morning to night. You birth hundreds of thousands of parasites, all of them fertilized by your master.

Trivia
While both Julie and Jessica take you to their perspective workplaces after being infested the prompt the player is presented with for Sandra is simply "Head to the strip Club." When arriving at the Strip Club the flavor text says that Robyn works there, not Sandra. During the sex scene at Robyn's house Robyn acts as if she has not seen Sandra's breasts before which she would certainly have if Sandra stripped. Therefore, it seems unlikely that Sandra herself is actually a stripper. It could be that she is a waitress or works in an administrative capacity at the club or is just friends with Robyn and doesn't work there at all.