..."Oh... My... God! He was fucking you in the arse mummy. Double Wow!"
I retreated into the furthest corner of Jack's office, glancing around like a deer caught in headlights, frantically seeking somewhere to conceal my disgrace; there was simply nowhere to hide and with Anna blocking the doorway, no escape route either. With nothing beyond the diaphanous chemise to hide my embarrassment, I'd clamped one arm across my breasts whilst the other hand grabbed a sheet of paper from the printer to drape like a curtain before my crotch; I knew full well that the shift's hem almost, but not quite, covered my swollen pudenda, having very carefully shortened it, to achieve precisely that effect. Having my daughter Anna catch me in flagrante with son-in-law Matt could never be considered the beau-ideal of my marriage and motherhood, but it would surely have felt worse if my husband Jack, or God-forbid my elder daughter Judy - Matt's wife! - had arrived home early that day?
Anna moved from the doorway and perched herself on the desk, though short of my clambering over said desk -- God how much would that display! - there still remained no avenue of escape. Anna was shaking her head and smiling, clearly amused at my plight: "Oh Mummy, stop being so prissy, I must've seen you naked a thousand times..." My discomfort moved toward embarrassment as she added: "Though that Brazilian's new." and reached a pinnacle as she ended: "And as for Matt, well I'm sure he must know you both inside and out by now?" I was mortified and felt my whole body flush red; it came as a blessed relief when Anna turned her face and attention towards Matthew, who appeared to be handling Anna's intrusion with far more equanimity than I'd managed, perhaps too much? He'd lounged in the office chair since Anna's arrival, looking cool, calm and totally unruffled; smiling amiably and seemingly unperturbed by either preceding events, or his own ongoing nakedness.
My bewilderment at Matt's composure only grew as Anna leaned forward, casually traced her fingers across his thigh and then back and forth along the length of his flaccid prick; a cock that still glistened with my own juices! "This surely wasn't the first time that you've screwed Mummy?"
Matt shook his head as he replied: "No, that was when Judy and I visited back in November."
"Of course, you were here for Guy Fawkes weekend. So where and how did you first do it? No, wait! Let me guess..." Anna's gaze returned to me, a wicked smile playing across her face during the long moment before she continued: "Matt cornered you in the bathroom, bent you over the washbasin and thoroughly rogered you; without a please, thank you or by your leave, then walked out leaving you collapsed and leaking onto the floor... I'm right aren't I?" My lowering eyes and beet-red face were all the confirmations that Anna needed. "I knew it! I'll bet you found it absolutely awesome too didn't you Mum? I still get an ache in the belly and a tingling between my legs whenever I remember."
My mouth gaped open, I was lost for words as thoughts, feelings and memories raced through my mind; not least the phrase which Matthew had harshly whispered into my ear as he'd fucked me that first time: 'I guessed right, you're a slut, just like your daughter.' That sentence had revolved in my psyche ever since and now realisation finally dawned. It hadn't been Judy that Matt was referring to at all, my 'slut daughter' was Anna; he'd fucked Anna too! My head snapped up and without thought I glared angrily at my daughter and snarled: "How could you Anna? Matt's married to Judy! Oh God, you've been sleeping with your sister's husband!"
Matt and Anna looked to each other in surprise, gave me a quizzical glance, and then collapsed in hysterical laughter; I glared for perhaps two seconds, before my own brain finally clicked into gear and I was obliged to join them. This second dose of embarrassment was at least a more light-hearted experience; the words pot and kettle, being much in evidence. As we recovered ourselves, Anna shifted the mood once more: "Oh Gosh, what am I thinking; how could I be so ill-mannered?" taking her hand from Matt's now noticeably firmer cock -- I couldn't help but mark how she licked her fingers clean upon doing so! - she threw her arms about his neck, hugged him tight, then kissing him on the cheek, loudly wished him a 'Happy Christmas'.
Squeezing past Matthew to reach me, Anna and I shared a similar embrace and exchanged seasonal greetings; then having pulled back a few inches, Anna stopped, looked directly into my eyes and pressed forward to kiss me once again. Anna's second kiss was nothing like the first, nor indeed any that we'd previously shared, her lips parted as they gently landed full upon mine and as the contact lingered, Anna's tongue teased open my own lips to match. Sensing no resistance, Anna's eager tongue probed further, whilst one hand slipped from my shoulder to reappear moments later, gently teasing at the soft folds between my now trembling legs. A married mother of forty-six sharing such an embrace with a girl of less than half her age might be passed-off as unseemly, or at worst inappropriate; but when that girl is her own daughter then it's surely just plain wrong?
Any vestige of guilt dissipated with that first pass of Anna's searching hand, one finger-nail scraped slowly and lightly along each soft fold of my swollen labia, whilst a third dipped gently into and dragged through, the damply yielding channel between; the animalistic growl of pleasure which Anna's touch elicited seemed to echo within both of our opened mouths. As my mind reeled it also spooled backward, it was no longer just Anna's face before me, but also that of Diana with whom I'd shared a house at university; it was she who'd been the first and indeed last, to touch me in this dissolute way. Neither of us were lesbian, indeed I had barely qualified as bisexual, but there were more than a few nights when either Diana or I had eased the other's heartaches -- both real and imagined -- with a hour of sapphic distraction.
It took just four passes of Anna's inquiring fingers to bring me to orgasm -- not one of which had even touched my clitoris! - and had she not then steered me onto Jack's desk, I suspect that I'd have collapsed to the floor. I could hear Matt and Anna speaking during the languid minute it took me to recover, though their words were beyond cognition; when Anna turned back to me, I dreamily enquired as to what she thought she was doing, stimulating her own mother in such a way? Anna's answer was a flippant: 'Well, I couldn't possibly allow Matthew to give you a better Christmas present than me?' -- and that was undoubtedly the moment when I ought to have brought our scandalous romp to a halt, but by then I'd crossed the Rubicon and wrapping Anna in my arms, I delivered a kiss that was every bit as carnal as her own. As we parted I smiled wickedly and reminded Anna that Matt had given me more than the one orgasm; the wanton smile which spread across Anna's face in the few moments before it sank from view, was all the answer that I could've wished for.