My sister-in-law came home at 9pm or later (if she stayed with her friends for a drink). Since he came home late, he slept in a separate room while my... sister, my niece, and I slept in one room. The incident took place 1 year in January 2019. Like every normal Saturday, my sister-in-law drank and watched a large number of movies in the closed room, causing me and my niece to sleep in another room. High volume means they have sex there! About 1am at night, I saw my sister-in-law sleeping with. D.s.m world, if i have learnt anything over the years its best to find out as much as possible about what people want ?what a person says can differ so much in real life, so with that in mind i reminded them both that they both had a safe word to fall back on, they could beg of mercy etc, but unless they used their safe word it would not stop , they both nodded their agreement, so next saturday could not come quick enough , i duly arrived at theirs early that evening, having already told them. .. Alright," I said as I took the razor out of her hand. "I'll do my best." Good."She leaned back in the tub and raised her pussy above water level. I sat in between her legs about a foot away from her pussy. She laid down and her butt landed right on top of my erection."Woah... Someone's excited!" she laughed."You could say that," I joked.My erection was poking into her butt cheek as I took the razor and placed it on my mother's pussy. I gently started to shave the hair off, hoping not to cut. I want you to be able to take pain babe. And I want you to associate pain with sex. From now on, for the rest of your life sex without a bit of pain isn't going to really do it for you. All those boys who will be pawing at your tits and pussy will leave you cold babydoll. It will be ok, but it won't be mindblowing. Part of that is your nature and part of it is everything that I'm doing to you tonight. I'm molding you ... I'm making you into a sweet little pain slut for all the men in your life..