<em>"I think I'll teach you the basics of anal</em>said Katherine.<br/><br/><em>"Oh fuck Mom, I've always wanted to try that!"</em>said Scarlet. 'Of course you would' thought Emily. Scarlet would happily stick her fingers in the electric socket if she thought it'd feel good. Emily considered herself by far the more sensible one. That said, she had had thoughts about it. Now, maybe, she'd get to find out some more about it.<br/><br/><em>"Well I doubt either of you are ready to actually try full anal sex. We'll just start with some basic fingering today though, alright? Now Scarlet, I want you to begin fucking Emily and leave the rest up to me."</em><br/><br/>"Um...." Emily said shortly before her snatch was invaded without warning by her sisters cock. Any comment she had was immediately replaced by a sigh. She was full again and it felt gorgeous. Not quite 'as full' but it was pretty good nonetheless and since mum had just said she would prefer the pair fuck each other rather than other people all the time, she thought she could quite possibly get very used to having Scarlet inside her. She even wondered whether it was possible to get fucked while you were asleep? The first thing you'd know about it was when your partner came... Oh that got her so horny there just weren't words. She let out another sigh as Scarlet clamped on a boob. At least she was doing it gently. She took a hand to stroke her sister's hair.<br/><br/><em>"Oh Em, you're a bit tighter than Mom, that's for sure,"</em>Emily grinned at that.<br/><br/>Scarlet let out a breathless 'Oop' and arched her back - thrusting harder into Emily's pussy as she did so.<br/><br/><em>"Now, now Scarlet, it's only a finger,"</em>said Katherine.<br/><br/>"It's only a finger." Emily parroted with just a hint of amusement to her sister. She had felt the same thing the same time as Scarlet had. It felt odd but not unpleasant. Kind of like a light buzz or tickle without being annoying.<br/><br/><em>"OH FUCK!"</em>Scarlet yelped as the finger went inside. Emily let out an "eek!" that was half surprise at the finger and half surprise at how far Scarlet's little poker could poke. She didn't say anything about that though.<br/><br/>The finger just kept doing its thing. Swirling and turning inside her bottom. The buzz had got more intense but the tickle had subsided - at least for Emily. Since it might be easier for Katherine to reach her, Emily raised both legs and clamped her ankles around Scarlet's lower back. The change in angle certainly worked in Emily's favor, Scarlet was thrusting harder now against something inside which was driving her absolutely bonkers.<br/><br/>Scarlet was still more or less over Emily's chest. She wasn't always sucking on a boob now because she was often coo'ing or ahh'ing because of the finger in her bottom. When she thrust forward a little further, Emily leaned down and whispered into her ear "No eating me out this time. If it is your cum in my pussy then I want it there for a long time." She did love her sister. For all their sniping at each other that was as plain as the erection on Emily's front (sliding up and down on Scarlet's chest actually). What better way to tell your sister you loved her than to have something of hers inside you all the while?