She's filthy (M34F61)

So I recently found out that my mother in law is filthy. I was at hers and she wanted to know if there was any way to hide pictures on her phone, I showed her how to open the secure folder and she asked if I used it and if it was any different to the normal picture album. I opened mine and showed her it was the same, she saw how many pictures I had in there and she said I was as filthy as she is. We have always been close so this was no surprise to tell me. She asked to transfer her pictures but asked me not to look, told her I would have to in order to select them. She said that it wasn't fair unless she saw mine. I agreed and we swapped phones. I moved looked through her pictures and couldn't believe how nice her body and tits are for her age. I moved hher pictures to the secure folder and gave her it back. She was still looking through mine. She said that we should meet again alone when no one will walk in on us