This is a prime example of why most blood fetishists & sanguines have permanant partners. Sucking the blood of someone you just met is incredibly dangerous for a number of reasons. Get yourself to a doctor. Let them know you ingested human blood. Trust me, they've heard weirder things & it will only help them in figuring out what is going on. There are a number of possibilities both paranormal & mundane. First could be drugs in her system, legal or not, alcohol, then there is the possibility that through the blood you may have tapped into her SM side, which took the image of a girl with red eyes. Talk to Devin, tell her what happened & that you are a little confused by it or however you chose to put it. But first & foremost GET TO A DOCTOR. In the future, don't agree to drink the blood of someone you just met, in fact, don't drink the blood of anyone for whom you haven't seen a clean bill of health & by that I mean actually see the test results not just taking their word. Blood play can be extremely satisfying but needs to be done safely to truly be enjoyed.