Whining distracts the "scientists" and disrupts the experiment! And then they'd have to stop, and leave him there til his erection subsides, and then start the whole process over again. What a waste of lab hours!

(And speaking of threats - taking a left turn into even wilder kink territory here, I've always been rather disappointed that there wasn't more guro kink fic taking advantage of Russia's heart. I mean, for heaven's sake, it already falls out on its own. Seems like it'd be quite a juicy little power trip, there, literally taking hold of his heart and squeezing it while fucking him, to keep him in his place, to watch him shudder and squirm…)