We'd all gone to bed - I was feeling comfortably full after my pizza - and I was just drifting off to sleep, when I heard the unmistakeable sound of my bedroom door opening, and the silhouette of my sister slipped through the gap, closing the door after her. "Beth," I whispered, "what are you doing?"
She didn't reply, pulling back the covers and sliding in beside me, covering us again. I felt a thrill as I realised she'd left her Disney nightshirt in her room, soft curves pressing against me skin to skin. "Beth...?"
"Missed you," she murmured, sliding her arm across me.
Gingerly I wrapped my arms around her. "This is... nice. But you can't stay - what if Mum comes in first thing tomorrow?"
Beth let my question go unanswered. "Is this just... nice?"
My mouth opened in surprise as I felt her fingers wrap round what was rapidly turning into an erection. "You didn't get a second turn this afternoon," she whispered. "And I didn't hear you doing anything when you went to bed."
My voice was puzzled. "Hear?"
"I, um, listened at your door for a bit."
Even in the dark I felt her face warming. "I was hoping you would..."
"I thought about it," I confessed.
Her fingers moved a little more on me. "Well, I'm glad now you didn't, it means we can -"
I reached down to disentangle her fingers from me. "Beth... we really can't."
"Why not?"
"Well, first of all Mum and Dad are just across the landing. And I don't have any -" I couldn't believe my own words - "um, protection. And anyway, it's wrong."
I felt Beth smile. "Tim - I'm glad you put those in the right order. Danger of discovery, concern for me. And 'wrong' - whatever that means - as an afterthought."
She snuggled closer. "I don't care about 'wrong', not really. And I have my pills, so you don't need anything else. So we only need to not get caught."
I chuckled softly. Typical Beth logic, dealing with obstacles - I remembered when she was tiny, and the bird she wanted to stroke at the aviary had flown off - 'But Daddy will get it back, won't he, Mummy.'
I dared a soft kiss on the top of her head, her hair fragrant. "OK - I'd be lying if I said I didn't want this too. So can we talk about it tomorrow?"
"Mm-hm. Just one more thing and I promise I'll go back to bed."
I felt her take hold of my hand, drawing my fingers downwards until they encountered soft fur then warm wetness. "See how ready I am for you," Beth breathed. "Touch me."
I explored her with my fingertips, getting a gasp from her as I brushed her hard nub. "OK," I forced myself to draw my hand back. "Tomorrow, I promise."
"Taste me?" she requested, and I touched my tonguetip to my glistening fingers, then sucked them, sweetness and oh-so-arousing muskiness almost overwhelming my senses. "Go on, before I change my mind and we wake Mum and Dad up when you come, noisy girl."
Beth gasped softly. "Oh god, can't wait."
Reluctantly she slid out of bed, looking back once more as she slipped through the gap in the door. "Night, Tim."
It took me longer to get to sleep this time, unsurprisingly, and I wished Beth was still in the spare room so I could listen to see if she was doing anything to deal with her own arousal. But eventually I drifted off, and the next thing I knew was the morning light, and Beth - now decently covered - bringing a mug of coffee in, putting it by the bed. "Hiya."
She grinned. "Mum and Dad are going out again today, so we have the place to ourselves."
I sipped at my coffee. "OK. Have you had breakfast?"
Beth shook her head. "Want to come down with me?"
I swung my legs out of bed, reaching for the long t-shirt I wore if I needed to be around the house before I dressed, pulling on my boxers. "Sure."
Breakfast was cereal again, and I waved distractedly as Dad closed the front door on the way out. "Now," breathed Beth, "back upstairs?"
"Mmhm. Your room or mine?"
"Your bed's bigger," Beth hinted.
We went back up, and Beth didn't hesitate, pulling her nightshirt over her head. "Thought you wanted me undressed first?" I teased.
"Not an issue any more," she smiled. "But come on, catch up."
I took off my t-shirt, then removed my boxer shorts, and Beth followed through on her fantasy of the previous day, sinking to her knees and taking me into her mouth. "Mmm..."
I gasped. "Not too much, or the other thing won't happen."
She relented, straightening again. "OK, why don't you lie on the bed."
I complied, and Beth slid across my body. "Oh god, I can feel you against my stomach, so wet," I breathed.
"Can be wetter," she hinted, leaning down so that her breasts were in reach of my mouth, and for the first time I felt her nipple between my lips. "Ohh..." Beth moaned softly, "that's just like I imagined."
I moved to the other breast, using my fingers on her now-damp nipple, and as she'd promised, the warmth and wetness against my stomach increased, Beth flexing her hips a little. "One video I didn't show you," I murmured. "Do you want to move up and I'll use my mouth somewhere else?"
Beth shook her head. "I want you to do that - god, how good will that feel - but right now I need you in me."
She lifted her hips slightly, reaching back, and I felt the exquisite sensation of her entrance against my tip. "It might hurt a bit," I cautioned, but Beth just lowered herself slowly, her mouth forming an O, her eyes half-shut, as I penetrated her fully. "Mmm, oh, wow..."
After a few moments she rocked her hips experimentally. "Mm, that's perfect, I can feel you on my nub too."
I reached to touch her breasts, and she gasped. "Oh - if you do that to my nipples I think I could get there first."
I shifted position slightly so that I could reach her breasts with my mouth, suckling each nipple softly in turn, using my fingers, and Beth's movement on me became more insistent, her muscles starting to tense. "Oh, one more thing and I'll definitely come."
I watched fascinated as she put one finger in her mouth, using her tongue to make sure its whole length was wet, slippery, then reached back, her hand out of sight. I had no difficulty knowing when her finger touched her other entrance, her face displaying utter satisfaction, and again she rocked urgently against me. "Mm - feels like - can't wait until that's you inside me there -"
Her head tilted back, and she cried out, reminding me of my tease in the night that she'd wake our parents. I felt her tighten around me, her muscles rippling, her hips pushing into me, then she broke, gasping for breath. "Oh my goodness."
She leaned forward, resting her body on mine. "Tim - that was perfect..."
After a few moments she lifted her head. "I'm amazed that didn't get you there."
I smiled. "I was concentrating on you."
"Still, it's your turn," she hinted. She slid off me, kneeling with her back to me and looking over her shoulder. "I think I know something you'd like."
I moved up close behind her. "Something a bit like your video, maybe?"
I slid into her from behind, unable to keep my eyes off her pink star, still moist from Beth's finger and the slipperiness that must have made its way from her other entrance. I started to move in her, and Beth moaned softly. "Mm, that feels amazing - different again from when I'm on top of you."