Most of my adventures I write about have been with men, but as a bi guy I have had more than a few encounters with women as well. They tend to have been a bit more vanilla but there is one obvious one that is anything but, as it tells about the first time I fucked my mother in law! I first met her over 30 years ago. My then new gf had told me how every boyfriend she took home had fancied her mum, and when I met her I could understand why. At the time she was a 38 year old divorcee with a boyfriend, short blonde hair, slim with really great sizeable but perky boobs. She also had a great personality, friendly but with a wicked sense of humour. Everyone who met her said she was the double of Susan Sarandon and she really was (still is)! Of course I fancied her and sometimes fantasised about her, but never thought about anything happening. So the years pass and we both get older. She has had a few partners who came and went, but for the past 10 years has been on her own. About 5 years ago she moved into a flat which needed lots of work doing on it. The MIL has no idea about DIY and money was a bit tight so I ended up doing lots of jobs. I am fortunate that I work from home and set my own schedule so even though my wife was working I could still nip over there when I wanted. The day it all changed was boiling hot. I was installing new kitchen units so decided to start early. The MIL knew I was coming over but, because I had my own key and she liked to sleep in, didn't bother getting up when I arrived. Sometime after 10am though she appeared in her dressing gown and made us a cup of tea. I was kneeling on the floor as she perched herself on a stool and chatted away and I remember thinking how good she looked, even with no makeup. She still worked out, ate sensibly and took care of herself, so strangers often assumed she was in her 40s rather than almost 65! The morning wore on and I made progress whilst the MIL kept me supplied with drinks. At one point she decided that she was going to sunbathe and changed into a white beach robe kaftan type thing. It was semi-transparent enough that I could see the bold green bikini she had on underneath. For lunch we sat in her garden with a sandwich and a drink (beer for me, a bottle of wine for her). She quickly managed to polish off over half the bottle and became a bit giggly and chatty. We were not flirting but were joking around about this and that and we got onto her having a great life now she was settled and single. I was a bit surprised when she blurted out that all she missed was sex! My expression made her laugh and she teased me, saying that she had obviously shocked me. I denied this, saying it was just that, knowing what a flirt she is once she has a drink, she must get attention when she goes out. She said she did but just from men her age, and then she really floored me by saying "old men are no good for me, they are done or worn out before I even get going”;and then leant over and put her hand on my arm, "a quick shag doesn't do anything for me, I like to take my time with a bloke... you know..." and then dissolved into laughter. I was still only seeing this as banter but was enjoying seeing her loosen up because of the wine, so encouraged her to tell me more. The banter continued and she picked up on my flirting comment. "I've had half a bottle of wine and I'm not flirting with you" she said. "Aren't you?" I said, pointing out she had brought up her sex life. "Oh, when I flirt with you you will know it" she said and tried a smouldering look which she ruined by giggling. As she worked her way through the rest of the bottle we continued with this back and forth, me rating her flirting and she pushing it a bit further, being a little more suggestive every time. The only problem with this was that I was now seriously horny and had a raging hard on under the table, which would be obvious if I stood up. I was just wondering how she would react if I did just that when the front doorbell rang. When she went to answer it I dived back into the house and rearranged matters to hide my bulge. Thinking the best distraction would be to get back to work I started back in the kitchen. A minute or two later she popped her head round the door to say she was going in the shower to wash the suncream off, and with a cheeky wink said "and I'm putting the lock on, just in case". I heard the shower start up as I carried on working but was too distracted and horny to concentrate, so after about 40 mins decided to call it a day. I had gotten into the habit of bringing over a change of clothes and having a shower before heading home to keep my car clean. The shower had gone off a while ago so I assumed the MIL was outside or in the living room but, when I tried her bedroom door, it was locked. She called out to give her a moment and, after a short wait, she came to the door in her beach robe and let me in as she stepped out. Her shower room is tiny so I got out of my grubby clothes in the bedroom before showering. After drying I went back into the bedroom to dress, but stopped as I could hear a faint noise. I thought it sounded like a plug socket shorting so moved round the room to find it. Quickly I narrowed it down to the bed and, on lifting the pillow found a purple silicone rabbit type vibrator buzzing away! I was so stunned that I didn't do anything for a moment, and just stood there staring. My instinct was to turn it off and picked it up, but then had second thoughts as I noticed it was still wet and, on closer inspection, still had the unmistakable aroma of a woman's sex. Now as horny as before I only hesitated a moment before licking it to savour the delicious taste of my MIL's pussy juices, imagining I was licking them from her cunt. I was still naked and as my cock hardened to a full erection I started masturbating, but had to stop after a minute or so when the MIL called through the closed door to ask if I had time for a drink before I went. I shouted yes and quickly replaced the still buzzing toy before dressing and going out. My erection was showing no signs of abating but I had my grubby work clothes in my hand, so just held them over the bulge until it hopefully subsided. There was little chance of that though because, as I walked into the kitchen, the MIL was bending down to get beers from the bottom drawer of the fridge. I was admiring how shapely she was when it struck me that I couldn't see the green bikini bottoms. Sure enough when she stood up and turned to give me my beer there was no sign of the top either. My heart was pounding like a naughty schoolkid as I clearly saw her nipples standing erect under the cloth, and even a slightly darker hint of the areola. She was holding a beer in each hand but making no effort to pass one to me, and we just stood there for a few seconds. Eventually she said something like "do you see something you like?" and, with a saucy smirk, rubbed a cold beer over each nipple. The chill made them even harder as the condensation made the thin cloth transparent and stick to her skin. I let out a groan and, dropping my work clothes, gave her an opportunity to check out the hard on straining against the thin material of my shorts. It was only a brief glimpse though, because in a moment I had my arms round her, kissing her and feeling her tongue excitedly pushing back into my mouth. We were clamped hard against each other and my now rock hard cock was pressed into her stomach. Her hands were on my back but she slid them down, inside my jeans to grab my buttocks and pull me even harder against her. I could not wait any longer and breaking the kiss. pulled the robe off over her head in one motion. I had a moment to admire how well she had taken care of herself, with still shapley boobs with the most perfect nipples and a flat stomach before I returned to kissing her. She is only 5' 2" and slim, so I had no problem lifting her up, and she proved to be pretty flexible, wrapping her legs round me so that she could grind her pussy against me. I lifted her like this onto the newley installed worktop and, breaking from our kiss again, knelt down to spread her legs wide. He pussy looked delicious, pubes neatly trimmed and wet with beads of her juices. Putting a hand behind each knee she held her legs wide so that I could open her up to lick at her labia, the dark skin soaking wet and delicious on my tongue. She was gasping and crying out, and got louder when I licked and sucked my way to her clit, before pushing my tongue deep into her. Her hips were jiggling trying to move against my lips, and I responded by matching her with thrusts of my tongue. We kept this position for a minute or two and then I stood up. Immediately she leaned forward to kiss me, clearly not minding that my lips and face were still coated in her juices. As we kissed I pushed first one finger then a second into her and started to finger her. She joined in by reaching down to rub her clit, matching the speed of my fingers. She was panting and gasping so much we had to break our kiss, so I kissed down her neck to her breasts. Her panting increased when I first kissed and licked, then bit her nipple, and in a moment she started to shake as her pussy clamped tight onto my fingers. For the first time she opened her eyes and gave me the deepest, hardest kiss possible before dragging me to the bedroom. As I stripped she lay on the bed watching with her legs spread and fingers playing with herself. When I dropped my trousers and let my rock hard cock spring into view she let out a moan of pleasure. I climbed onto the bed between her spread thighs and as I kissed her again started to rub my cock against her pussy. She groaned but then pushed me back and rolled me onto my back saying "oh no, its your turn first." With more kisses she moved down my body until she reached my swollen member. First she grasped the head and rolled my foreskin back, purring as she squeezed my shaft before taking me into her mouth. I could feel her tongue against my helmet as her lips slid down the shaft and I groaned as she started to work my cock. She was lying on her side with her pussy tantalisingly close to my head so I moved over to give her another licking. We ended up in a 69 with her on top grinding her hips as I pushed my tongue into her as deeply as possible. As amazing as this was (and her pussy was as delicious as the blowjob was incredible) I was ready to fuck her, so I rolled her over onto her back and started to rub the head of my cock against her so very, very wet cunt. This time there was no objection as I pushed into her, easing in halfway to her moans, which turned to gasps as I pushed forward to give her my full length. I started fucking her slowly at first, but she was soon gasping for it harder and I didn't disappoint. I was varying this hard fucking with gentler thrusts and more kissing, as I didn't wasn't to cum too soon. After a while though she begged me to take her from behind, and in a trice she was on all fours screaming as I held her hips and pounded her. I tried to hold back but before long I felt the familiar pressure. She must have felt the same as she was begging me to cum inside her, and I was only too willing to comply. The orgasm was incredibly intense, made more so by her screams of pleasure and the tightening of her pussy. Eventually I pulled out of her and we flopped down, laying together covered in sweat and panting. She was in no rush to get up and I was still stunned with the shock of how things had developed so quickly and how amazing it had been. We started talking and she admitted she had often thought about me over the years and especially recently when I had been working in her flat. I told her how horny she had made me and how I had been tempted to show her how aroused I was, and she confirmed that she had pulled her vibrator out and was masturbating thinking about me when I disturbed her. She also admitted that she had been looking through the gaps in the blinds to see me naked when I got out the shower, but it was only when she saw me playing with myself as I licked her toy that she decided she was going to have me, and slipped her bikini off in the kitchen before calling out to me. As we lay there talking in that hot room, heavy with the scent of sex, I not only got my breath back but also started to get hard again. The MIL noticed this as well and was delighted, helping to get me hard with another fantastic blow job, before taking my second load of cum whilst riding on top of me. Finally after another shower and more kissing I left for home. They night I had a few texts from her saying she was horrified at what we had done, but then followed it up with one saying she hadn't washed as she wanted to hold onto the smell of my cum.