A huge unnatural orgasm... monster?

It all came extremely fast. I felt it all rushing back again, yet a million times amplified. I screamed in pain and pleasure, blinded as I constantly screamed. Mia too began shrieking and bashing me up against the ceiling. I knew I wouldn't be able to stay conscious, but suddenly my cum began wooshing out of my pussy, actually stretching it with the pressure. I drenched Mia and finally finished my orgasm, collapsing as Mia, too, collapsed. Then I realized something was wrong.

My cum was not falling to the ground - it was surrounding Mia! I watched as she struggled using her tentacles to escape, yet it glowed white so I couldn't see her, and became clear again - Mia was gone. I backed away as it moved as if controlled by an intelligent ****, and suddenly it rushed forward. I screamed as I realized it was re-entering my vagina, stretching it once more as it became a part of me. Before I knew it, it was gone, as if it was all a dream.

I breathed heavily, and realized in horror that I seemed to remember more than just random parts of Lily's memory which seemed to be coming back better as time went on - but I remembered everything Mia remembered. Her childhood, her parents, the fact that she had no control once she was overtaken by the tentacles. I sobbed to myself while wondering what the hell just happened.

Then, suddenly, my mobile phone rang.