I pulled out of her, and Beth curled up on the bed, ignoring the total disarray her clothes were in, the sticky whiteness between her thighs. "You promised me something," Sarah reminded me, and Beth turned to watch as Sarah knelt, took my still-hard shaft between thumb and finger, ran her tongue up it from base to tip, tasting, swallowing, then again. "Mm, Beth, the taste of you, and his stuff..."
I threw Beth a knowing glance. "Remember what you said, about a younger man having more stamina? I think I could..."
Sarah's eyes widened. "Oh! Oh, yes, please..."
I put my fingers under her chin. "More fantasy, or a little closer to reality? Your choice."
She chuckled. "What a dilemma. But until yesterday all this would have been fantasy anyway, so... make it about how you really feel."
I nodded. "Well... I'm with someone, she's gorgeous, I love her very much -" I saw Beth's soft smile, and she rolled over, propping her chin on her hand to listen - "but there's someone else I keep thinking about. I've known her for a really long time, she's - well, a good friend, she looked after me when I needed it."
Sarah raised an eyebrow at my creative description of motherhood, but she let me go on. "She's a little older, but sexy as hell -" this time Sarah grinned, putting one hand on her hip and vamping a little - "and she's featured in my fantasies since I found out that girls were different."
Now Sarah's curiosity was piqued. "What sort of fantasies, exactly?"
I snorted. "Teenage boys aren't exactly sophisticated, are they. They imagine seeing bare tits, she's on her back, opening her legs, somewhere wet and tight they can stick their thing - and they're reaching for the tissues, right?"
Sarah chuckled. "I had to empty your bin, remember."
"But I grew up a little from there. I used to watch you when you went out for dinner with Dad, think about what you were wearing under your dress, deliberately give you a hug so I'd catch your perfume. I'd imagine you coming home but Dad not being there, it was me taking off your dress instead."
I glanced at Sarah. "What I imagined you wearing underneath - well, all in black, stockings, bra, panties with lace at the front so I can see - you know."
She put her hand over her mouth to cover a smile. "They say life imitates art, don't they. So... in this fantasy, what happens when you're taking off my dress?"
I caught Beth's wink - of course she'd already imagined this for me, almost our first night. But here was Sarah in the flesh, a warm, living woman, ready and waiting for me to get us from 'now' to 'ohh...'
I moved behind Sarah, just as in Beth's fantasy, my hands cupping her bottom for a moment then resting on her bare stomach. She pushed back against me, fingers on my hip, and I heard the smile in her voice. "Mm, I can feel you, you're still a bit sticky from before, even though I used my mouth."
"Sticky like this?" Beth queried, using her finger to catch white slipperiness from her entrance, deliberately sucking it clean.
Sarah turned in my arms, kissing me firmly on the mouth, and wrapped her fingers around my shaft. "Oh, so hard."
I watched mesmerised as she pulled the front of her panties down a little way, moved closer so that my hardness was between her thighs, her fingers pressing me upwards against the warm wet lips of her entrance. She gasped quietly, then looked into my face. "Not inside, not this time, you understand, Timmy?"
She flexed her hips a little, and I felt her nub pressing against my shaft. "Mmm," she breathed.
I started to move more insistently, and Sarah's face showed increasing pleasure. She shifted position slightly, then "Oops", I gasped as my next thrust took me inside her. "Do you want me to stop?"
"Yes," then a pause, Sarah closing her eyes, her face showing her internal struggle. "No - I -" then her eyes snapped open. "Oh god, you're going to make me - ohhh..."
I felt her tighten deliciously around me, and even though this was my second time tonight, I couldn't help myself, thrusting hard once, twice, then yielding to my own climax. Sarah's expression turned dreamy - "Oh, so much..."
***
We were still sleeping in a tangle of limbs when Sarah's phone started to ring insistently. She rolled over to pick it up, "Hello? Oh, hi, darling."
Beth winked at me as we listened. "Oh, that's great news, we'll wait to eat until you get here," Sarah smiled. "See you later, love you."
Sarah put the phone back on the bedside table. "We need to talk, don't we."
"I'll get us all coffee," Beth volunteered, walking to the kitchen, returning with mugs.
Sarah wrapped her hands round her mug, sighed. "I guess I have to go back to being 'Mum'."
Beth concentrated, thinking. "You don't think Dad -?"
Sarah shook her head. "He doesn't even know about you and Tim, remember. No, we'll have to keep most of our secrets."
Beth nodded. "OK."
A thoughtful smile returned to her face. "But if by some chance I can persuade Daddy to be nice to his baby girl..."
Sarah's face showed mild shock, then she caught her lip between her teeth. "You'd try?"
Beth nodded. "And we're here for a few more days, aren't we - you could both be a fly on the wall, see how it turns out. That door upstairs, remember."
Sarah blinked. "And here was me thinking we'd already broken about as many taboos as we possibly could."
Beth finished her coffee. "Right, then. We'd better take a look around, see what we need to tidy up. There's a washing machine under the worktop, isn't there..."
Tidying up took a couple of hours, then we showered - "Oh god, Tim," breathed Sarah, "if you keep doing that but don't finish what you started, Bill isn't going to know what hit him when we get to bed later."
Finally we were dressed, everything looking 'normal', and Sarah started to make lunch. "Are you going to try your plan this afternoon, Beth?" she queried as she stirred a pan.
"Mmhm."
"But how will we get to watch?" I asked. "Bill has to think you two are alone."
Beth grinned. "Didn't you see the fire door at the end of the hall upstairs? We leave it open, you two 'go out for a long walk', then circle back and up the metal stairs. Simple."
"When you put it like that," I chuckled.
We heard tyres crunching on the drive, then the front door opening. "Hi, everyone."
Sarah walked to meet Bill, putting her arms around him. "Missed you."
Beth and I both got a hug - I thought Beth deliberately stayed in her father's arms for a little longer - then we all sat down to lunch. "How was the office?" queried Sarah.
"Oh, it was a storm in a teacup," Bill shrugged. "But it's sorted now."