Very INAPPROPRIATE Fetish

My husband (27) has a foot fetish. That in itself is not the issue. However I just found three screenshots on his phone of girls 10-13 years old in swimsuits with their feet out. I know he is using these to masturbate with. We are also in the process of buying a house and I showed him the facebook profile of the lady we are buying the house from. They have two college aged girls and one high school girl. Well I found two screenshots of their girls by the pool/with their feet exposed. Not only is that inappropriate but extremely weird.

We have two girls, ages 3 and 1. We are in the process of closing on a house. I have talked to him several times about me hating his use of porn. He doesn't use it often but I have cried to him several times about it making me feel disrespected and undesirable. I did a boudoir photoshoot for myself after I had our second child and took a few photos of my feet for him but he never looks at my photos. He says he forgets the book even exists and that he will try and use it more.

I have NEVER found young girl pictures before and I am speechless and do not know what to do. Divorce and leaving are not currently on my mind. I know I need to have a discussion with him but I am not sure how to start, what to say, what to do about this. My mind is spinning and I am trying to get my thoughts straight before talking with him.

Edit: I am in no way saything is is acceptable or okay. This is absolutely inappropriate and wrong and will be discussed. I will mention therapy and marriage counseling but I do not think he will go through with that in fear/embarrassment of what he has done. We are in a healthy relationship outside of this issue which is why I never saw this coming and don't just want to give up our marriage if we can get counseling and he STOPS this behavior completely. But that doesn't help my feelings of what if he doesn't, what if he just hides if better, and those thoughts will probably never go away completely.

Another edit: I mentioned the photos of me to let you know I have felt unattractive/undesirable for awhile now and that is our past history. I just found the photos TODAY. I am not trying to sound like I am more worried about how he feels towards me. What I found today is absolutely a more important issue. I just included that other statement as background information.

Update: We had a long discussion and it is far from over. He mentioned that it has never been anything sexual and he has never masturbated to any feet pictures. He agrees it is highly inappropriate. He agreed to go to counseling. I also mentioned I don't know exactly what I want to do yet about our marriage and that we should back out of the house since we are not in a stable place.