I would get them looked at by your Dr or dermatologist. Promary outbreaks can last anywhere from a week to a few weeks.
I kissed her.... No oral sex at all... But can there be any other reason for that blister, like an allergy? Also, one of the blister has burst and a few more have started growing. How long will the initial outbreak last
If you kissed her it could be. Or if you gave oral sex. This isn't as common but still a posibility.