Boyfriend licking my feet?

I’m 25 and for a while now my 46-year-old boyfriend has been asking me to let him lick/suck on my feet. When I ask him why he says it’s because I have sexy feet. Though I tend to walk around barefooted often at home and my feet tend to get rather dirty from wearing sneaker shoes without socks on. I don’t like it much and feel very awkward when he does it. Often in the mornings he tells me he’ll let me stay home and take a leave from work if I let him lick my feet, and since I tend to get very bad migraines in the mornings then I usually don’t object.

Though recently I noticed he has been waiting until his mom leaves for work before asking/telling me. Is this weird? Any advice? And just so you know, he is in complete denial of his anger problems, I doubt he would be anything less than in denial of any kind of problems.