If you're looking for ideas for the next chapter, I have a very dirty vision of poor Steve with balls so swollen he can barely walk. Perhaps they're so heavy that the scientists are afraid to allow them to just hang, as it might damage the tissue, so when steve isn't sleeping or strapped to a table being milked he's shuffling along with his big, sensitive balls resting on a little stool with wheels that he pulls along between his legs. The whole semen collection thing completely taking over Steve's life, and everyone in the military facility where he's staying knows it and it becomes a normal thing. Going to the mess for food and everyone can see the poor guy shuffling in with the little table between his legs and being completely used to it.