Kaolla Su, as 2nd princess, is obligated to provide 2 heirs to the throne in the event that something happens to her older sister and her husband, the crown prince. Monarchies have their strength in bloodlines. Selective breeding for Su's intelligence has clearly worked. Think about all the crazy stuff she's built in a very short time. An indestructible king with her intelligence and his kindness would lead to a golden age, even if he's only working from the background. Money and help raising a baby isn't even an issue for her. She's got the whole staff behind that.
Besides being sperm donor, a consort is a last line of defense protecting her from danger. His immortality makes him an excellent human shield. The incident with the bear also indicates he's got Haruka and Seta's instinctive shooting ability. You might not know this, but the best way to take down a charging bear is break its shoulder or hip to slow it down, then put the second round into its nose. If you aim for the nose and miss, you hit the head, lungs, heart, or spine, all of which are fatal hits. Charging great bears are rare though. Its mostly Black Bears that hunt people. The interview was basically to determine if he was an acceptable father for their grandchildren or someone they should forbid her from seeing. I'm sure lots of fathers would like to exercise the veto option in so literal a way.
Legally, he's less than a husband, more of an allowed concubine, just a male version. This still leaves her open to marry him or someone else, which will have higher requirements and committment. More than he'd be willing to do, even for Kaolla. As it is, he's got access to the royal treasury within reason, and the official exclusive right to the Turtle Culture ruins, which is an entire career right there. If he sticks with it, he's going to be in Molmol a lot of the time, rather than in Hinata. Haruka and Seta will be with him too. Keep in mind a find smaller that those ruins is an entire career. There are smaller lost civilization ruins around the world which occupied teams for decades researching, documenting, cataloging. If he gets tired of it, he can find the other outposts of the culture in the Pacific. If you've never done fieldwork, its exhausting and very satisfying at the same time. If you can do it with a spouse, the location and the energy can be transcendant. If your spouse stays, you end up with marital problems because field work gets you horny, and most researchers can't keep it in their pants, of either sex. So, its good that Keitaro will have Kitsune with him if Kaolla is busy. Now, to write up how Kitsune comes to terms with their unusual arrangement....
Besides being sperm donor, a consort is a last line of defense protecting her from danger. His immortality makes him an excellent human shield. The incident with the bear also indicates he's got Haruka and Seta's instinctive shooting ability. You might not know this, but the best way to take down a charging bear is break its shoulder or hip to slow it down, then put the second round into its nose. If you aim for the nose and miss, you hit the head, lungs, heart, or spine, all of which are fatal hits. Charging great bears are rare though. Its mostly Black Bears that hunt people. The interview was basically to determine if he was an acceptable father for their grandchildren or someone they should forbid her from seeing. I'm sure lots of fathers would like to exercise the veto option in so literal a way.
Legally, he's less than a husband, more of an allowed concubine, just a male version. This still leaves her open to marry him or someone else, which will have higher requirements and committment. More than he'd be willing to do, even for Kaolla. As it is, he's got access to the royal treasury within reason, and the official exclusive right to the Turtle Culture ruins, which is an entire career right there. If he sticks with it, he's going to be in Molmol a lot of the time, rather than in Hinata. Haruka and Seta will be with him too. Keep in mind a find smaller that those ruins is an entire career. There are smaller lost civilization ruins around the world which occupied teams for decades researching, documenting, cataloging. If he gets tired of it, he can find the other outposts of the culture in the Pacific. If you've never done fieldwork, its exhausting and very satisfying at the same time. If you can do it with a spouse, the location and the energy can be transcendant. If your spouse stays, you end up with marital problems because field work gets you horny, and most researchers can't keep it in their pants, of either sex. So, its good that Keitaro will have Kitsune with him if Kaolla is busy. Now, to write up how Kitsune comes to terms with their unusual arrangement....