I guess the skewer was cooled that went through her tit's because it had already been applied to her thigh. It's all just the fun of academic torture. Love the detail of torture. Your so right about brands- that is how they brand humans-painful as Hell but not really pulling up too much dermis.
Maybe I didn't write it clear enough, but the idea was that she got first burned by a hot iron on her thigh and after putting that iron back in the fire, he got a cold skewer, like the ones used with barbecues, to skewer both her nipples.
I wonder if they will be abused more on the stage because I love the callous nature of staged bitches being tortured for entertainment.
That's also a setup I enjoy, public humiliation and suffering.