At first I thought I had the best in law's. Then the mother in law changed into this total dominant know it all bitch. We couldn't do anything right as far as she was concerned and as we were living in her house while we saved for a deposit on our house we had to keep the peace. I was working morning shifts so I had to have dinner ready for everyone when they got home of course her mashed potatoes had to be prepared seperate from the others as she did Not want any salt or butter in hers. So this day I had enough of het slagging off at her daughter ( my wife ) as I'm mashing hers i thought ill fix you Cunt so I wanked myself off snd blew a huge load of cum into her mash. After she said the usual No salt No butter I smiled & said of course not she ate the whole lot I watched every single mouth full as she ate, by the end of dinner I couldn't get up straight away I had such a raging boner. I added my secret ingredient every single day after that. I would always jump at the chance to get something for her just so I could add a touch of my love to my favorite mother in law. Added a dollop to her mouthwash, her special milk, even convinced her to try some of my homemade custard. If I was in the bathroom topping up her mouthwash I would dribble a bit of my batter on her toothbrush as well as on her shampoo. Never got angry with her again. My wife eventually caught on to my toppings but just turned away smiling without a single word.