butt worship
Butt worship describes images where a character is appreciating another character's buttocks with some form of physical interaction. This can include kissing, hugging, licking, rubbing, sniffing, squeezing another character's butt, and/or is sticking their head in between the butt cheeks of a character. Butt worship can also be a part of several other acts such as facesitting, analingus or cunnilingus, or sexual domination. Butt worship may also be portrayed more literally - usually for comic effect - with characters bowing, praying, or displaying other acts of respect/reverence, to a character's butt, as if it were royalty or a deity.
Oftentimes, butt worship images will involve characters with big butts, huge butts or hyper butts, though large buttocks aren't a requirement for this tag.