Not long after Yuuri moves to St. Petersburg, Viktor and Yurio discover that they are, in fact, half-siblings. Viktor is delighted and turns his Annoying Big Brothering up to eleven while Yurio is mostly just in denial that he shares DNA with him. (Bonus Points if Yuri is crushing on Yuuri and feels extra conflicted about his crush now that he's more or less his brother-in-law.)

Viktor asks Yuuri for advice. Yuuri is bewildered Viktor thinks a childhood with Mari could be in anyway comparable to having Yurio for a sibling.