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I pull out my cock and stroke it as my wife fondles and sucks her sister's tits. Sam is holding her head and caressing her hair, and Meg runs a hand down Sam's belly and into her panties. Sam gasps as my wife plays with her pussy. I've never seen her this forward and aggressive, and it turns me on.

Meg pushes her sister against the washer, rising up to kiss her hard, keeping her hand in Sam's panties, and using the other hand to fondle and mash Sam's tit. Sam is helpless, moaning and quivering in her sister's grasp.

Sam breaks the kiss and moans, "Oh, God, sis. Your fingers light me on fire!" Sam pushes Meg back, but not so far that my wife's hand leaves Sam's pussy. Sam bends lower and sucks Meg's fat hard nipple. Meg moans and strokes faster in Sam's panties. Then my wife puts her other hand into her own panties, and she starts pleasuring herself as well. I'm wanking like mad now, enraptured by the incestual lesbian display before me.

Sam breaks her liplock on Meg's tit and cries out, her hips rhythmically jerking to the beat of her orgasm. As she comes, she moves her hands up to grope Meg's tits. Soon Meg is coming too, her voice rising and falling with a familiar cadence. Somehow I haven't exploded all over the basement floor.