Pure whimsy is often the sole motivation for some Femdom games. Male slaves provide amusement as well as labor.
This Domme is playing a strap-on fellatio game with one of her slave men. The rules are simple. While kneeling in bondage the slave must suck on her dildo without falling over. A feat harder than it may seem. He has difficulty maintaining balance and ankle muscle fatigue quickly.
She is indifferent to his success. When he fails, as he inevitably will at first, she’ll punish him with a few stinging lashes. Once the slave is proficient she’ll have to invent a new game.
Thinking up games for her slaves is entertaining in itself.