The person that Mistress Iori teaches as a human urinal is Naru, a perverted masochist transvestite. Start by placing her nose perfectly against Iori-sama's anus and memorizing her scent.
Naru crawls on all fours like a dog and brings her extremely thick dildo to her mouth. Iori-sama inserts a dildo that is so thick that it is difficult for her to hold it in her mouth into Naru's ass hole.
Naru has to clean the dildo brown with her own poop with her tongue...
