Goddess Shae Fatale struts into the room and tells her slave that it's milking day. He hasn't been milked in 28 days. He better produce in the time she chooses to take to milk him or else it'll be another 28 days. He lays there tied up and gagged and must try hard to produce sperm for her despite how broken and sore he is or else she is going to get angry. She may even take his balls.