Anal bloom
The fetish of liking how the shape of your anal looks like. The closest thing I can use for metaphor is how people have some hobbies looking at a flower's anatomy and seeing it in an elegant way like taking pictures of a flower blooming except it's the anal.
The way this anal stretch and squeeze is exemplary as well as the curves it has just brings naught but happiness to a monsieur like mine especially as it stretch and squeeze like no others! OH HOW THIS ANAL BLOOM!