Dimitri has to deal with Sergio, he is a lad who cannot stay out of trouble for more than a few minutes. Its like he wants to find himself ass up looking at the carpet, and there are a lot of naughty guys out the who do. So when Dimitri gets him OTK and starts to spank him that cheeky smirk Sergio has appears, maybe its bravado and a way to hide what he is really thinking. By the time his bare ass gets the treatment he is reaching round trying to fend off Dimitri, that smirk is struggling and as always Sergio is thinking maybe he has gone to far this time.