Colorful little nails

Guess whose little feet are these?

Experts

This conversation started out with me asking M to throw some stuff into the waste paper basket for me. While carrying out the task, he grumbled "why am I the expert in throwing things?".

Then J said that he is the expert in Lego Hero Factory. M said he is the expert in plaster (coz all ailments can be solved with a plaster and he can paste it on himself).

Then I asked what expert am I then?

According to M, I am the expert in loving.