Boot worship
Boot worship is a term for the practice of extreme adulation of boots in BDSM, usually carried out while the footwear is being worn by the dominant partner.
It is related to foot worship in a derivative way, in that the adulation may really be attributable to the proximity of the boots to their master/mistress. The foot is usually considered one of the "lowest" and least appreciated parts of the body, and it is a kind of humiliation to be kissing and licking someone's foot.
In Boot worship, the humiliation goes one step further. The submissive willingly worships the dominant partner's shoes, and often without even being asked to. This reverence for the footwear that encloses the dominant partner's foot is sometimes an expression of extreme devotion or loyalty, sometimes a concrete admission of inferiority or defeat, and sometimes both.
Thus boot worship may include sniffing or inhaling from worn boots, as well as licking, kissing or cleaning their exteriors by licking. Sometimes polishing of the boot can also be done. Chewing and eating of leather shoes can also be done.
It may also consist, more passively, of the submissive lying prone and being "trampled" by the dominant partner. Heeled boots may lend themselves to sucking, in an approximation of fellatio, anal and urethra insertion. The dominant partner can also sometimes beat the sub or slave with the footwear while wearing it. They can also have the submissive lying down in front of them and then place their boots over the submissive's mouth, face, or body instead of the floor.