"Your wife had not been too happy when your father became unable to look after himself, and rather confused....and you'd suggested you let him live in your house. Caring for him meant attending to his needs, and not upsetting him regarding his memory loss..... when he started calling your wife by his ex wife's name , you both shrugged and let him believe that his dear old wife was still alive. When he started groping "his wife", and asking her to please him sexually, your wife had , of course, recoiled in shock.... but this seemed to cause a decline in his mental health. You eventually agreed that perhaps she should allow him to "touch her", and perhaps some light kissing - certainly nothing more - ...and for a few days he groped your wife's tits and ass frequently, and then one day... in front of you on the sofa, fingered her surprisingly wet pussy ....she opened her legs to let him finger her more easily, and was embarrassed to find that she really enjoyed it. Your father kissed her open mouth, and you watched , transfixed and shocked, as your wife orgasmed on his fingers.... you heard your father moan "suck me off, Harriet darling "... your wife looked helplessly at you... you nodded... and within minutes she and your father were undressed on the sofa, your wife worshipping your father's fully erect cock....her lips opened, and she was taking your father's length willingly in her married mouth . Your father fucked her regularly after that....and your wife orgasmed loudly whenever she was taken by him."