A friend that is officially only a friend, but you really want to cuddle with / take care of them (and
maybe go down on them in your imagination), but you gotta be really careful because you aren't
single and you
don't want your partner to think you're cheating because you definitely aren't actually cheating, but your imaginary fantasies about your friend are really strong, so you need a phrase to describe your percieved not-quite-girlfriend.