If you click on any manga, scroll down, on the right will be a section labeled "Top tags", click any one of them, then on the top right you will see a search bar labeled "Search other tag", type in "pet play" and hit search or enter, you'll get about 21 pages of results.
Kaiser is gonna explode like barou did fr isagi makes them kneel then they become x10 stronger and x100 more obsessed with isagi lmao