listen, "Nobles" in boobplate are never a good sign unless there are harem shenanigans afoot, and as one other already commented, part of why Dias agreed to this whole shotgun marriage is to avoid the hassle of a not-a-harem. (The other parts being avoiding being the monster next door and out of respect for Aruna.)
I am quite curious though since the attendant guards are all women as much as we can see, making it almost feel like an Adepta Sororitas type situation. Or whatever the legion Princess Pina from Gate led.