Princess Serenas stinky feet already can be smelled through her sneakers. The slave must get his nose very close to her shoes and thus inevitably smell the intense scent they areemitting. Her sweaty feet are enormously stinky because the dried foot sweat from the previous day is still sticking to them. The slave cannot block out the smell because it is just so enormously penetrating. Princess Serena airs her stink bomb shoes and the slave now fully smells the scent of her feet quite intensely. Can you imagine how that must feel in the nose?!