I've always loved just how completely Saori surrenders herself to you.
When you first meet her she is the disinterested bitch you see her in 1. By the end of the game she is utterly in love with you and all that you pound into her. Her face in 336 looks almost reptilian from the sheer animal instinct that wipes out her mind as she screams away her dignity all so she can squeeze one more drop of your cum into her womb. It's the face of a female that wants to reproduce more than anything in the world, and knows she's just been flooded to her limit with the best possible seed. Saori shrieks and throws out that crazed ahegao because she craves the pleasure of becoming yours, because she adores and worships you. Because Saori knows you are her master.