Well now I'm picturing some bored intern being in charge of the fucking machine or manual milking (cause maybe they have to give him a break from the machine every now and again? Maybe it's too harsh and is wearing out his genitals idk) and literally just jerking Steve off, listening to the radio or looking at his watch waiting for lunchtime cause his wrist is getting tired. He'd know that when Steve starts making certain noises and his cock twitches that bit more and throbs in his hand he needs to get the collection jar ready, and pretty soon Steve will be squirting into the jar while the intern runs his hand down his cock, squeezing every drop out while Steve goes cross eyed