Pixiv post was tagged by the artist with Rudeus Greyrat, therefore tagging as such along with incest and related tags.

GabrielWB said:

Pixiv post was tagged by the artist with Rudeus Greyrat, therefore tagging as such along with incest and related tags.

It's distant cousin incest, do incest bros actually care about that?

Looking it up, it says she's a second cousin to Rudeus which is generally legal most places though not always culturally acceptable.