I often walk around and meet many annoying people, but when my poor slave is just before me then I finally can be the boss and relieve my stress: I kick him hard. It is not his fault but I enjoy it and that is what matters! I like to kick him up!
Lucy plays with her slave, she makes him feel good. But this is not really about making the slave feel good so she continues playing with him, in a way that she could enjoy it more. After the slave had a good time he is much more sensitive and the Lucy uses this to pain him hard!