Surprised And Enjoying It

My 63 years old neighbor, with whom I always had very little contact, just the casual hello and good morning, told that her back pain was starting coming back and asked me if I could give her a massage on her shoulders. Nothing wrong with it, and I did my best to help her. The next day she asked me again for a massage, but this time she wanted to be laying down, so that I could do it in all her back. I said: yes, no problem, I'll do my best.
I go inside her house,she got in her room and called me after 10 minutes more or less... To my surprise, she was only with her panties on laying in the bed, and I couldn't stop noticing that she had a huge breast and a nice fat ass, that I never thought was possible.
I started to massage her back on the side of the bed and everything was going as it should. This was until she said that I needed to be over her, as I was hurting her a little bit. I was just dressed with shorts and a T-shirt, because it's Summer and was hot.
As I was over her back, my cock started to touch her ass, and getting hard.
She obviously felt it and said it was feeling better and I could stop.
I get off the bed, but I was still with this awkward erection and this is when she turned around and I saw that she indeed had a very large big pair of tits.
She turned to me and said: Don't you feel ashamed? How can you get excited with someone that could be your grandmother and continue with such nice hard cock?
On that same moment, she pulled my shorts down and grabbed my cock and said: I haven't seen cock this hard in years, and I don't mind if you cum on my tits or on my face.
While she was saying this, without any hesitation started jerking me off and out of nowhere, starts blowing me.
And somehow, I didn't care about it and grab her head and tried to make her deeptroat.
She didn't enjoyed, and got a little bit angry with me, but instead of kicking me out, she takes out the panties, and get her huge ass up on doggy position.
Without hesitation, I start to fuck her as deep and hard as I can. She moans and screams asking to not stop and somehow I keep getting even more excited stretching her huge ass. I look at her tight butthole and spit at it, just to get my finger inside and check her reaction.
To my surprise, she begged me to fuck her in the ass, because it was going to be her first time and she wanted to feel a hard one inside.
I grabbed the massage oil, squirt it on that super tight asshole and I go all in one time.
She's screams in pain, as I keep stretching her ass cheeks and kept going balls deep.
Her ass was so tight that in a matter of minutes I simply was going to nut. I took it out and give her a huge facial that she loved and wasn't already waiting for it.
After a nice shower, we went back to the bed and I got the best and longest BJ ever.
I spent the last week fucking her all the time and we're going to meetings again.
She called me yesterday saying that she wants me to just fuck her in the ass a whole day.
She's still very tight and makes me cum fast, but I can't wait to hear her begging me to fuck her butthole.
Oh, I almost forgot to mention this... She started trying to deepthroat and always swallows now. The best thing is that I can cum everywhere knowing that she won't get pregnant.