I stumbled upon a page from a manga that had a mechanical dog fuck a guy. The dog's design isn't even similar to the Winter Soldier's metal arm, but my brain made the connection anyway.

(In case anybody's interested, nsfw like hell, etc: http://yaoikink.tumblr.com/post/57520646413/ginkaku-hakushi-to-marmot-by-reibun-ike#_=_ )

So, let's imagine HYDRA scientists didn't only invent metal arms, they invented beasts, too. Maybe dogs, maybe something bigger. (cough cough) Hell, maybe an entire zoo. They are fully functional - almost that is, because of course they don't cum. Which also means they can go on forever.

So why not let them loose on a certain asset/prisoner of theirs?