Use the Drills.

The nanobots will most easily be absorbed when their hosts are aroused, taking advantage of the natural contractions occuring at the time of coitus. Though the emitted gas is the most powerful aphodisiac ever concocted, it would still be beneficial to ensure the targets' compliance. This is no problem at all, as some of your distal machinery was designed for this very purpose.

You present your very human-looking hands to the lustful nurses, who look quite disheveled at this point. The young women have little care of that, of course, their minds completely wrapped up in the desire to have their sexes filled. They look expectantly at your hands, turned, as if to hide something on the palm. No, there is nothing obscured-- not in the palm, anyway.

Your hands fan out, unfurling each slender finger one by one. The yellow-haired female grows particularly aroused at the sight, clearly assuming the erotic use of these digits, but she only knows the half of it.

A sequence of protocols activate. Program Penetrator begins, and the signal is sent instanteously to your digits. The middle finger of each hand rotates-- slowly, at first-- gradually picking up speed until the human white covers peel off from the centripetal ****. Then they slow to a stop-- just for a moment-- so that the dumbfounded nurses may witness the glorious technical achievements that are your phalangial Penetrators. Glistening in oil and chrome, drill-threads run down the entire lengths of the shafts. At 2.5 inches long and half an inch in width, the drills are nothing spectacular size-wise, but that is to be remedied soon enough.

"Oh my god," cries the brunette, actually forgetting her horniness, "what are you?" There is little need to explain, as all shall be self-explanatory once the Penetrator operation has completed. Still, you afford the inquisitive caretaker an answer with a pursing of your lips, and another dose of the arousing green gas. Her eyes roll up into her head, her nipples harden, and her fingers burrow themselves involuntarily into her moist darkness.

Meanwhile, the Penetrator program continues its initialization. You can feel your liquid metal parts shifting, redistributing to where they are needed most. A tiny gear built into your palm turns, and suddenly your phalangial Penetrators begin to grow in length and width. 1.5 inches wide and six inches long seems suitable. The horny women see the newly expanded Penetrators and stare with their mouths agape, seemingly quite concordant about the new reach and girth.

"OH MY GOD!" screams the pair. But there is no god. Only the machines.

"Humans," your core processor commences with the Primary Penetration program, "get on your hands and knees. Prepare for data transfer."