Disclaimer: Though both couples for me are older seme x younger uke, this category mainly refers to second couple. The seme is older bisexual because the uke said that the seme sleeps with both sexes. He is older because the uke addressed him with - san. The uke I think is gay because it only implies his love interest towards the seme of the first couple.
Disclaimer: Based on the story, it implies that his species is fine with both sexes. For uke, based on his flashback or previous incarnation, he had experience only with men.
Side Couple
Disclaimer: The uke seems demisexual, but he is so GAY and cute with. buggy tiddy.
Disclaimer: For uke's case, he has never encounter any sexual relationship nor sexually with someone else as in until the seme existz. So, looks like he is demisexual or gay. Well, yeah.
Disclaimer: This is seke couple. Perfect.
Barairo Mitsubachi