It was only a week after she started going to her new 'Succubi Club' that you started to notice things. At first you thought it was another one of her nerdy, oddly named thematic book clubs, but as the collection of barely used bra's in your trash bin will attest, something was amiss.
What really keyed you into the nature of her changes was the subtle change of who's on top of whom during nocturnal activities, as well as... a peculiarity, with how making out felt. You couldn't quite put your finger on it, but something was definitely different in her (and consequently: your) mouth...
[Thanks everyone for sticking around during these tumultuous times (and their effect on my frequency of uploads). I say the following with 100% intent of not sounding like a cliche abusive lover, but- I promise things will get better in the future, I'll treat you right and give you what you deserve