Is it normal my boyfriend licks my feet in plastic when we have sex???

I love my boyfriend, he's a very sweet guy and I don't have any kind of problem with his fetish, he loves my feet. His fetish is harmless. We already have a good relation going for almost 2 years. This may seem a little strange for some of you, but everytime before we have sex he asks me to take off my socks and to cover my bare feet with a pair of blue plastic foot covers or booties, you know which i'm talking about?? Those little blue plastic baggies you wear over your socks or over your feet at the hospital, in surgeries... I have absolutely no problem wear them for him!! (i do it already for 2 years and never had a problem with it)
The first times, when we started dating he would already ask me to put them on, once i asked him why he liked those plastic things so much, he said that he loves plastic and loves to see my foot soles and my toes tightly wrapped in that thin blue plastic.
After putting them on I go sit or lay down, he approaches his face to my feet and startes gently smelling, licking and sucking the plastic that covers my foot soles, toes and heels. I don't dislike it at all, i may even like it. Its a kind of a ticklish feeling when his tongue is going over my plasticized foot soles, in the meanwhile i finger myself. This whole "cover in plastic" thing is only a kind of a foreplay, after this, we have sex and i keep the plastic booties on. Another thing that he likes to do sometimes is to cum on my plasticized foot soles.
We consider our selves to be a very ok couple and we love each other very much.
??????
If you don't know which are those "Booties/foot covers" i'm talking about, here is a pictures of me wearing them.

!! BUT MY MAIN QUESTIONS ARE:
Is this normal??
Have you ever worn those plastic booties on your socks or feet??
Have you ever had someone doing this to you??
If it was you, would you let your boyfriend do it??
What would you do??

Thanks a lot, people :)) Lots of kisses, Sara ;))