By reading this I feel like you're trying to put something inside the game just for the sake of it, and not because you're actually into this fetish.Just that I have no idea what people actually do or say. Do people like kissing and/or licking feet and kiss and suck on the toes or is it just about being jerking off with the feet? Things like that. I see Anh and Julie's toes as cute but that's about it.
I might be wrong, but if I'm not, then be wary on this subject. The first rule in developing adult games is working on stuff you truly enjoy doing, don't let it become a hassle.
Even though we're still in the early game I consider this game to have enormous potential and it would be a pity to see it abandoned due to loss of enthusiasm/burnout on your side.