"Yes, but not with the boys around."

Sara's mother's raspy reply through the beginning of her second orgasm intrigued you and your cock pulsed as the image of your sister Charlotte, masturbating here with Sara and her Mum, shook you.

Sara's fingers were blurry and her pussy was making a wonderful racket as she hit the peak of her own climax. "She used to love spreading her legs and fingering her pretty little twat on the sofa where Mum is now." She gasped.

Tamara, done with her own deeply felt orgasm, slumped forward and released a strong clear stream of piss that soaked the rug and almost drowned out her moan.

You're done edging and the slow build of heat throughout your whole body, from your nipples to the fingertips on your dick, almost overtake all your senses. But you're just aware enough to pick out Tamara, now perked up, contributing:

"We used to talk about boys she liked and watch lots of porn together! Charlie's great! Her favourite is **** porn!"

And like a hammerblow to your sternum, you explode.

Sara's position cuddled up against you, and the angle of your dick, means that she takes five or six heavy blurts of cum over her beautiful face and tits.

At this point, the day's toll takes over, and you blissfully lose control over your bladder as fatigue and relief floods you, and both you and Sara are flooded in hot piss. Relishing the fact that you need feel no shame here, you let yourself revel in what a turn on the entire situation is.

At some point you find that your eyes are closed and a blanket is over you and Sara, but you're both still naked and soaking wet on the couch. At some point after that, you dream about your sister Charlotte, and what tomorrow will be like at home.

Actually arriving the the next day, showered and sadly dressed, which discomforted you more than you'd have guessed after less than 18 hours of living the dreamlike life Sara had revealed to you, You found Michael and Lucy, your older twin siblings, leaving the house together, since they worked in the same general area in the city. Since your parents were out until after midnight tonight, that left Charlotte and you home alone together. As long as she was here.

Please let her be here.

Crossing the front door you hear the shower running louder than usual. As you reach the upper landing, you realise that the door to the bathroom is open, and Charlotte's thick, curvy frame was partly visible through the hazy shower curtain. This wasn't uncommon for Charlotte when she thought no one was home, and now you could make more sense of it, the times she'd been walking around or making food or watching tv in just a towel now stuck out in your mind.

You could scarcely believe how turned on her round ass and soft tits made you. The hint of bum you could make out was going to be in your imagination for years to come. She didn't seem to have noticed you, so you left, depositing your things in your room and changing into a set of very comfy pyjamas.

By the time you left, Charlotte was downstairs in the kitchen. You made some noise on your path to not sneak up on her, and heard a mad scrambling from the doorway which sounded less like the cooking and cleaning from a moment ago and more like laundry.

Rounding the doorframe, you see a slightly flustered Charlotte looking absolutely radiant in just the small towel from her head, her long, flowing red hair now hanging wetly around her. The towel was very short, and from behind the bottom of her bum definitely showed, from the front, there was a seemingly endless expanse of naked leg which you could not drag your gaze from at first, only to have it flick instead to her heaving cleavage.

Gathering yourself and responding to her barely-percieved good morning, you started to make a cup of coffee and came to a decision making point. What do you want from her and how are you going to ask?