Some women have fantasies where they're "kept" like a pet.
(Obviously with non-abusive, not-50-shades, in other words kind ML.)
This is apparently a manga targeted at that Josei demographic.
I won't judge anyone's kinks. Hell, I enjoy a manga where a female teacher is walking yuri-bait.
As long as things remain consensual, I think this is a perfectly acceptable kink to spectate.