[boyo] The Story of a College Student Who Takes a Job as a Human Toilet

Ahegao (アヘ顔) refers to the exaggerated facial expression of ecstasy commonly depicted in hentai. The face is typically shown with rolled-back eyes, protruding tongue, and flushed skin. This visual trope has become iconic in adult manga and is used to indicate intense pleasure or overstimulation. The tag covers both subtle and extreme versions of the expression. It frequently appears alongside tags like 'big breasts,' 'nakadashi,' and 'multiple male.'

Bondage (緊縛, kinbaku) is a fetish tag covering restraint and bondage scenarios in doujinshi. This ranges from simple rope bondage to elaborate suspension scenes. The artistic treatment varies from realistic kinbaku (Japanese rope bondage) to stylized fantasy restraints. The tag covers consensual BDSM scenarios as well as non-consensual restraint (when paired with 'rape'). Related tags include 'collar,' 'handcuffs,' and 'femdom.'

Collar (首輪, kubiwa) is a costume/accessory tag indicating characters wearing collars, often in a BDSM context. Collars symbolize ownership or submission in kink scenarios. The tag covers both decorative collars and functional bondage collars. It frequently appears alongside 'bondage,' 'femdom,' and 'pet play.'