I arrive home from my late shift about midnight. I'm greeted with the usual sight of my sister-in-law, Donna, asleep on the longer sofa, a blanket covering her. When I've taken off my coat and put my work bag away, I sit on the 2 seater sofa, as normal, and find something suitable on the tv to wind me down ready for bed.
Half an hour later, Donna pulls the blanket down to her waist, and her pyjama top up to her neck, still fast asleep. With my wife happily snoring away upstairs, I look freely at Donna's very nice DD breasts for a while, wishing I was allowed to touch, before going back to the tv. Five minutes later she begins to stir. I look over to see if she is waking up. She is still asleep, just a little restless. She starts to knead her right breast. She strokes the breast, and squeezes a little. Then she begins flicking and pinching her nipple as her breathing starts to speed up. I watch, fascinated, as she gets her nipples rock hard. Then she just stops, her hand still resting on her breast, with her hard nipplekind of ringed with her fore finger and thumb. I watch her bare chest rise and fall as she breathes. I start to imagine myself going over to her. In my mind, I take her nipple into my mouth, fondling her other breast with my hand. I would never cheat on my wife, especially with her sister, but I allow myself the fantasy.
Before my fantasy goes much further, I force it out of my mind, and return my attention to the tv. Not long after, I catch movement out of my peripheral vision. Donna suddenly slides her other hand under the blanket and, I suspect, inside her pyjama bottoms. From the movement I see through the blanket, she seems to be stimulating her own clit. She starts to moan slightly too. I watch intrigued, and slightly turned on, as her hand moves faster, her other hand kneading her breast again, and her moans become more pronounced. I look up at her face, and she still seems to be fast asleep. She moans loudly as one hand moves under the blankets and between her legs, while the other hand is alternating between squeezing her breast and twiddling her nipple. She brings herself to orgasm, moaning loudly and panting. I am, at this point, glad that my wife is such a heavy sleeper. When Donna has a little control back, she says, "You're amazing, you know that?" And then lies motionless, apparently sleeping still, looking as if nothing out of the ordinary has happened apart from her breasts still being on display.
