Your girlfriend turn into someone else when she sleeps

In the next morning, you wake up tiredly as the bright sunlight coming from your window. You can't even get up because you had too much sex on yesterday with your shapeshifting. It was really tired, but you feel so great about yesterday with your shapeshifting girlfriend. At first, you came to her place as you discover your girlfriend is a 'shapeshiftress' (female shapeshifter) and than have sex with her as she turn into many women you have sex. Then later on, you both came to your house and continue for another round and you asked your girlfriend to turns herself into your own mother and then have sex with her, this is the kinkiest and some weird **** thing that you ever had, this is going to be the best summer ever you ever had with your shapeshifting girlfriend. After you get up on your bed, you realize that you're naked. "Of course, we have sex without some clothes on." you thought yourself as you remember yesterday. "Anyway, I better be prepare for the breakfast, it's just me and my lovely shapeshifting girlfriend. Oh wait, I forgot she my 'mom'."

With that, then watch your shapeshifting girlfriend/'mom' who is sleep next to you last night, but she's cover by your bed sheet. "Wake up, 'mom'. It's time to wake up, your 'son' is calling you." you said.

"Just a little more time, honey." she said as she's sound so tired, but you heard your shapeshifting girlfriend/mom with a different voice. You were shocked and worried what might be happen to her. You than open your bed sheet to reveal and then you see your shapeshifting girlfriend is no longer in your mother's body anymore, she is now...