There's quite a confusion about who's the top or bottom in this one (though judging from the story I'd say dog is the top), but hey, just follow your unique 'BL instinct'ヾ( ͝° ͜ʖ͡°)ノ♪. This one feels just about right, even though I read another manga with a pairing just like this before (same demeanor, background status and all) and my BL instinct be like: "b-but I prefer them the other wayy" oh well, that just means that the story happens to contradicts your BL instinct.
The Royal Prince's First Love