Katrin meets her slave on a high bench, ready for to be ridden like a saddle.
In the beginning, she sits on his belly and teases him with her boots on his face.
Soon she moves foreward until she's sitting on his face.
She sits firmly, his nose is clamped good in her crotch... there is no oxygen for him, only smell from her crotch.
She turns around and places her ass reverse on his face, now she can lift her feet off thr ground for sitting with all her weight.
His nose deep in her ass-crack... that's "music"