I am a 52 year old divorced man and live back at my mum's house,she is 78 but still very sprightly but about 6 months ago she had a fall and injured her back,which meant me taking time of work to look after her. Anyway one morning after mum seemed a lot better she asked me to help her into the shower,now mum is about 5ft 4ins and about ii stone with large pendulous breasts and a protruding bottom.I left her in the bathroom and told her to shout if she needed anything after about 5 minutes I heard a scream I knocked on the door and asked if she was ok,NO she shouted my back has seized up,I had no choice but to go in and the sight that greeted me will stay with me forever,mum was bent forward in the shower completely naked her large breasts hanging down with water running on them and her bottom sticking out showing her pussy lips underneath,I leaned in and turned off the water and grabbed a towel it was obvious mum couldn't move and was in pain I gently tried to move her onto a chair and eventually got her comfortable and started to dry her then as i toweled her legs I realised my cock was getting erect and as I worked higher up her body my hand brushed against her pussy she just laughed and said it had a been a long time since a man had touched her there.When I finally got her back into bed I had seen every part of my mother's naked body and am ashamed to say I had the best wank of my life that night.