My mother-in-law

We invited my parents-in-law over to have an Easter lunch. My mother-in-law, +65 years old, still in good shape, maybe a bit posh, likes to dress up for the occasion. She was wearing a rather short black skirt,tightly covering her round ass, black nylons, mid-size heels and a blouse showing a bit of cleavage of her big saggy breasts. Her expensive bra was clearly doing a good job.
When welcoming them and carefully giving her three kisses, I put my hands on her hips and gently squeezed. She didn't give much attention, our eyes crossed for a second and then I complemented her on her outfit. She thanked me and smiled.
During lunch she was sitting in front of me. I couldn't resist accidently dropping a fork so I could have a good look down under. It was difficult to get a climpse of her panties, nice legs though! I pretended I was searching and managed to touch and squeeze her soft, nylon legs. She must have noticed. When I got up, she stared at me, a bit in shock, maybe a bit angry at first but then she smiled.She must have thought I'm a little pervert who gets off on mature women or nylons or both. I must have blushed massively but luckily nobody else noticed.
A bit later inside the kitchen she was trying to grab something from a high cupboard but couldn't reach it. I came close to help her out. I could swear that the moment I reach out, she pushed her ass against me, my cock was already hard, I can't tell she noticed. Was she testing her assumption? Thanks for your ... she paused a sec ... help, she said.
During one of the first nice and hot days of summer, I stopped by her house to drop off something. The gate was not locked, so I just go around back. She's outside lying on a sunbed enjoying the sun wearing just a bikini. She notices me and smiles. Hi darling, good timing, can you put some more sunscreen on my back please, very difficult when you're home alone? Carefull with my new bikini, I don't want any stains on it. Ok, I reply, maybe better to be safe than sorry, and I unlock her bikini top. I slowly start rubbing her shoulders and back, she's clearly enjoying it. Her big tits are squeezed and are sticking out a bit on the side. I make sure I don't miss an inch. Don't stop darling, you're doing a great job. Do you mind also doing my legs? Not waiting for my answer, she pulls her bikini pants between her butt cheeks so it looks just like a thong. No stains, right, she says. I can't help staring at her nice round ass and how the bikini fabric is covering her pussy. My cock is getting so hard. I started with her amazing legs and worked my way up her soft thighs. I could tell she spread her legs a bit as I saw the bikini fabric clearly showing a camel toe with a wet spot appearing in the middle. Was she getting horny too? Sure I was. Slowly I moved my hands up I gently started squeezing her round ass, spreading and rubbing her ass cheeks, so her asshole and her fat pussy lips become partially uncovered ...
Thank you for being so thorough darling, you're a real life saver, let me at least get you a drink. She slowly gets up, her tits all naked as I didn't close the bikini top yet. I couldn't help staring at her big and hard nipples. Oops, she said, can you help me with the lock dear? Ok, let's go inside, you sure look ... thirsty.