After Waking Up, the Sexy Goddess Became My Live-In Girlfriend

I got hit on a rainy night and woke up to find a mysterious goddess sleeping in my bed. She said she was my girlfriend and we lived together for half a year, but I have no memory of her. Until she showed the photo... She insisted that I was her boyfriend. I said to her, since you are my partner, it is not too much to have something happen between us...