My grandson also had a strange obsession with bare feet, especially mine (grandma) and his dad's. He didn't lick or bite, but would pet and caress them. Would cry out "Tee-Tee" whenever he saw my bare feet and rush to pet and caress them. Would lie down hugging on them or rub his face on them. He's almost 4 now and hasn't done it for almost a year. But for a while there we were a little concerned. But also thought it a little delightful to in a very weird way. It seemed to be a very loving response. But like you said only to certain people that he was very used to.
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