The problem was that most girls found it disgusting to know their shrunken slave actually enjoys it too.
So you had to try real hard to conceal it, not knowing how your owner might react if she catches you with a boner while licking her feet.
Here it was different, although you concealed it very good, once Lina read the comments from the previous post and found out about your foot fetish - she almost immediately kicked you away from her foot, then stood up, blushing red and stomped you.
You had no idea why did it happen.