Just as Rachel reached the door and had her hand on the handle, she heard a distant whisper. "Niiiiiiiiiiice..."
Rachel did an about turn, looking behind her. She turned back around and put her hand on the door handle... "Now then Rachel, let's not be hasty shall we!" Rachel buckled at the waist - her panties seemed to be vigourously massaging her crotch. "What the hell is happening!" she screamed, between gasps. "Isn't it obvious Rachel, i'm giving you the fucking of your life!"
Rachel felt a force penetrate her vagina, parting it open. The force knocked her to the floor - she backed up against the wall, sitting upright, facing the upright vanity mirror. She opened her eyes and could see the attack happening - the panties were split wide open - she hadn't noticed they had an open crotch slit - and her lips parted wide inside them. She could feel the force moving in and out as her climax built and built. When it finally arrived, she opened her eyes in shock, just in time to see a huge amount of ejaculate flow from the open maw.
As the orgasm subsided, Rachel regained her composure and stared at herself. She was sitting on the floor, surrounded by her own mess. Panicked, she lept up and tried to slip the panties down...
"I wouldn't do that if I was you..." said the voice in a forceful manner. Rachel, distraut, answered the voice back... "what, why? You, whatever you are... you just raped me!"
"Fair enough, but don't say I didn't warn you... Go ahead and remove them..."
Rachel paused and tried to think clearly...