Cute and thanks for the update! The banter between Britney and Luther is hilarious!
Also, lot of people may not know this, but first cousin couples aren't considered incestuous in Japan (and in many other countries), so it's possible the two cousins are endgame. Please note, though, the whole risk of biological defects associated with cousin couples is more of an exaggerated myth on the West's/America's part (though all Western countries legalize first cousin marriage, save for the States—and only half of the States, at that). The risk of birth defects for children from first cousin couples is actually only 4-5%, compared to unrelated couple's 2-3% (offspring from inner circle's like relationships between siblings, parents, etc. is about 50-60%)—first cousins have the same risk as a forty year old lady who's pregnant. Problems with cousins only start arising when one person's line of descent keeps doing it, because it increases the percentage of defect. So if A marries their first cousin B, and then their kid marries their cousin and has an offspring who marries their cousin, the risk increases and that's when you start seeing birth defects. Having a cousin reproduce with another should be fine, though, as long as one line of descent doesn't keep doing it every single generation (there should be gap years). I have family married to their first cousins and they have healthy kids who have kids of their own. The whole stigma around the union is more social than biological, and a relatively new one at that in the West (after all, so of the most famous figures who were cousin couples were Queen Victoria, who had nine children with her first cousin, and Charles Darwin who had ten with his—Einstein also came from a first cousin couple). So if it personally squicks some people that's understandable—just be open-minded that's not the case for everyone and it doesn't really, from a biological point of view, count as "incestuous" (actually the term causes more harm than good in the West, because it shames people into hiding the relationship between their parents or partner and is a source of a lot of discrimination). If no one believes me, a quick google search will confirm what I've said. Again, one doesn't have to like it personally, but know it's fine to ship the two cousins—there's no need to feel guilty.