Let a woman tell how back in the days as she was naive and inexperienced she lacked the ability to communicate her concerns and borders. Her boyfriend used to go down on her, what she really liked, but what she considered weird was that during it he used to stick one finger up her butt and he didn't probe or anything, he just left it in there motionless. He used to smear a mixture of her vaginal wetness and his saliva over his fingers for a smoother insertion what made it even more strange. But she hadn’t said anything, instead she just let him do it. He seemed to enjoy it and she didn't really mind. And so since it didn't bothered her that much, why not? Have her describe as detailed as possible how it felt like. Which physical sensations did she experienced and which physical reactions did they caused.