They met when Anture was 13, spent a few days together and then were separated for 4-5 years. When Anture returned to Shamier, he basically kidnapped Enrique, tied him up and under the influence of pheromones, they had s*x. It was closer to r*pe than s*x though because Enrique didn't know it was Anture at first. When he did realize it was Anture, he consented but it felt more like dubcon. After that they continued having s*x, which was reckless because Enrique was trying NOT to catch feelings for Anture.

Thir relationship seemed to be mostly about s*x and Enrique trying to have an heir. When the seed was planted, Anture left Shamier again for months. They met again when Enrique was almost due but then separated again because there was a war. They met again after Enrique gave birth, but then Anture left again to finally put an end to the war. They met again. They separated. It happened over and over again. Enrique falling in love with Anture was based entirely on the idea that absence makes the heart grow fonder.

As parents, Enrique and Anture were a big disappointment to me. Enrique fulfilled his promise to have two kids, one to eventually run Shamier and the other to take over the Ruben Empire. Anture was supposed to take the 2nd child to Ruben and raise him as the future emperor, while Enrique raised the 1st child. Instead, Anture gave up his place in the Ruben Empire and left his child to be raised in Ruben so he could be with Enrique. That means the 2nd child would be raised by the grandfather (the emperor) and nobles/maids, while the 1st child would get both parents. Enrique and Anture would only get to see the 2nd child on brief visits and maybe a handful of times. I don't think Anture giving up the crown was romantic though. It was selfish. I understand he loved Enrique and couldn't bear to be without him, but I would've preferred for each parent to raise a kid. They could plan visits to see each other until the children were old enough to be without them for long periods of time. In the side stories, you could see the effect of the 2nd child being raised without his parents because he was awkward during a visit to Shamier.