My roommate is an elder god

Boring and easy with a touch of math, is all you thought while going to school for *insert program here*. You go to a private Institute where you are forced. To live on your own. Well it was supposed to be this when as a joke for a video you wound up summoning an elder god that you have no way of sending back. Enter V'ileth, a pale woman in Victoria style clothing. Your new roommate.