Mother In Law Experience

So, Ive always had a thing for feet. My girlfriend had discovered this all on her own through me holding and kissing her feet and toes while I had fucked her and im sure through my browser history when I left my phone unattended. She confronted me about it one day and I nervously confirmed as it’s something I’ve always been a touch ashamed about. Luckily, she was also very into it and started doing things like encouraging me to suck on her toes while watching movies and rubbing her feet on my cock in public etc etc, it always seemed to get her into the mood genuinely, even more so than before. this Obviously removed a bit of the shame and added some confidence where it once existed.

Her mother is in her late 50’s, blonde, average height and weight and very very “motherly” in nature. She would always stop by for meals and just to visit and actually lived with us for a few months between rental homes. Her and her daughter were very close, closer than I had ever seen coming from a broken home. one day before she had lived with us on one of her visits she had explained that a guy she met on an online dating app was asking her to send him photos of her feet which was completely new and foreign to her. Without hesitation my GF says “oh that's not weird HE (used my name) loves feet! Instantly I felt a heat inside my face that I had never felt before and I'm sure a hue of colour to match. Luckily it was again met with excitement from the Mother and a few questions. The 2 I remember being “So, do I have nice feet” which I replied “Ah yes of course they're beautiful. You have perfect toes and they're always painted red or pink” and she did she had beautiful feet that she always kept perfectly maintained which of course kept me very intrigued. My GF would even ask from time to time what I thought of her moms feet and I would say similar things but then conclude with something relating to her age and how I would never do anything. Then we would change the subject by my putting my dick in her mouth or her having a Seat on my face.

The second question she asked me was
“So what do you do when you have a thing for feet” and I had answered very conservatively. Something like
“Oh I dont know, just like massage them and stuff”
“Oh please, you can tell me, what do you mean by other stuff, like do you like it when girls rub you with their feet?’”
“Ah ya (getting visibly nervous) and kiss them and stuff”

And with that the conversation ended and we changed subjects. The second her mother left I was balls deep in her daughter thinking about her mother. My girlfriend started licking her own toes while I fucked her in missionary, I pulled out and blew the biggest load I’ve ever even seen all over her toes and her face still sucking on them. Due to the size of the load, she knew I was exited about something but we never spoke of what it was.
see the rest in the comments.