To raise the tension, Principal Adams likes to chat casually while his spankees sweat over what's about to happen to them. Experienced spankees (which is every man in Dicks County) need a little psychological manipulation to get them more nervous, otherwise they get blase about it.
The giddy nervousness they feel in their belly and their balls lowers the pain threshold and, in a long spanking, increases the "runners high" endorphin rush, a learned response which almost all Dicks County men learn to experience since it's kind of a cultural norm there, you hear your friends talking about it and it becomes an expectation.
It's also common for even the most heterosexual men to get erect or even to spurt during spankings and no shame or special significance is attached to this, though onlookers may find it amusing.
The beginning is
here.