You've been dating a really hot girl/guy for years now and used to have lots of great sex. They have a preternatural talent for figuring out all about your preferences and secret kinks and have been extremely accommodating to you in every way, but as good as it has been, since you always end up feeling exhausted afterwards and have started to have some memory problems, you've been trying to reject their advances lately... and now you suspect that they are cheating on you... You confront them about it and they confess that, they have had sex with some others in the last few days, and they also tells you that they are a Succubus/Incubus. A kind of sex demon/vampire, who needs to have sex with someone, more or less daily or they will die and since you are more than a little doubtful, they magically sprouts wings and tail to prove it to you... They say, they don't want anyone else, but if you can't give them what they need, they won't have a choice... Also the reason why they always tried to avoid any questions about their parents, relatives, etc, is because... as a demon/vampire from another world... that was a bit difficult... They also tells you that they know the reason why you've been rejecting them lately, and they tell you, what you've been experiencing is actually, very likely because of their nature. They tell you they used to be living in a, kind of game like fantasy world, where demons like them drain lifeforce and xp from people, eventually however some priests cornered them and banished to Hell. Which turns out to be this world! Either that or they screwed up their spell... But in any case, since the system doesn't exist in this world, the effects were translated to making people exhausted and xp drain translates to causing some memory loss in this world.. And now that they've revealed their magical nature, they reveal that they can do all kinds of... though mostly sex related magics, if you want to spice things up... They can temporarily change their appearance... or yours... and conjure up all sort of toys and other items (everything is illusionary and temporarily though, so trying to sell them to make money or such is not really an option), and using their powers, would also mean that they would need even more sex... If you continue to have sex with them, you will continue to lose some of your memories every time... There is no way around that... What would you do? Alternative/Extension... If you chose to stay together with them and later found that they've been hiding something from you and outright lying a little... Your losing some of your memories is not a normal or inevitable part of it at all, but rather a deliberate act on their part... While they love you... In some sense at least... It turns out that, you're of the wrong gender as far as their preferences are concerned and they've been deliberately and selectively erasing some of your memories and "training" you, in preparation for swapping your gender and turning you into an immortal Succubus/Incubus like them, who can then stay with them forever... How would you take that?