Dead Batterries

My mother in law lives in an rv (her choice) in our backyard. My wife was out of town for a week with work.
Im 48 and mother in law is 70, 5’, 100pounds. Tiny ass and tiny tits but very sexy, widowed for over 10 years. The thought crossed my mind many times over the past years of having sex with her.
Wife was gone and mother in law calls me to come over that she needed some help with something. I go over and she’s in bed with the blanket pulled up to her neck and she says she very embarrassed cause she couldn’t change the batteries in her vibrator. We both laughed and I told her to give it to me. She handed me a lil small vibrator. I asked, now what’s this little thing gonna do? She said, well I small so I can’t take a big one and we laughed. I changed the batteries and turned it on said, now we need to make sure it gonna work properly (as a joke), and she said “boy don’t play with me-you don’t want this old lady”, jokingly I said “well I bet this ole lady needs something more that this toy”. Mother in law said, if your serious, I’d love to feel something that I Havnt felt in over 10 years. I grabbed the blanket and pulled it off of her and she didn’t resist. Her tiny lil body naked looked amazing and her pussy was swollen. I slowly moved down to her pussy and slide my tongue between her swollen pussy lips and she started cummin instantly. I stayed down licking her clit and eating her juices til she came 5 times and begged me to stop. I got up and took off my clothes and laid back. She went down and started licking my cock and sucked my cockhead. She looked up and me and sat on me slowly lowering her tiny pussy on my hard throbbing cock. She moan so loud as she lowered down with my cock stretching her open. Once she was down all the way she just sat there shivering cummin on my cock over and over again. She lifted up and her cum gushed out. She laid next to me on her side and asked me to please slide in her ass. That nearly made me cum, thinking about stretching her tiny ass open. She was using her cum to slowly finger her asshole. I pressed very hard and finally felt my cockhead inside her ass and she gave a loud yell. I slowly worked back and forth till I was balls deep in her tiny ass. She was moaning and cummin and her ass muscles squeezing my cockhead so hard I was starting to cum, I told her I was cummin and gave a huge blast deep in her ass, she quickly pulled away and grabbed my cock and pushed it in her drenched pussy as I continued pumping cum inside her. When I finished cummin, she turns around and started licking my cock cleaning me, then she laid back down. I asked her if that was better than her toy, she said yes it was much better. I rolled her over and slide back inside her ass, pushed ball deep and held it there. I asked her if this was better that her toy, she said yes and please cum in her again. So I did. Now we have sex weekly when my wife (her daughter) is at work. She loves my cock in her ass.