In the last thing Wolverine ever wanted to see, the hero, unfortunately, confirmed Marvel's worst romance, catching Scarlet Witch and Quicksilver together in the Ultimate Marvel Universe. In one of the grossest romantic pairings Marvel has ever made, the Maximoff brother and sister found love with each other in the alternate Marvel Universe. Sadly for Wolverine, he saw them in the act of passion, which confirmed the relationship with the rest of his heroes.
The Ultimate Universe is Marvel's second-most popular reality, as it allowed creative teams to tell alternate stories of popular heroes with different origins, powers, and motivations. However, during the Ultimates series' last hurrah in Ultimates 3, several storylines in the six-issue miniseries ended up pushing the boundaries of sex, edginess, and grotesqueness in the universe. Namely, when the miniseries romantically paired Scarlet Witch and Quicksilver, Wolverine was the hero to confirm their incestuous relationship to the rest of the Ultimates superteam.
In Jeph Loeb and Joe Madureira's The Ultimates 3 #3 by Marvel Comics, Wolverine warns the Ultimates that Magneto teamed up with Quicksilver to recover the Scarlet Witch's body. Wolverine recounts that when he worked alongside Magneto with the Brotherhood of Mutants, the villain tasked him with killing his son, as he couldn't bear to look at him given his human mother. After a failed attempt at killing Quicksilver, Scarlet Witch rearranges reality to stop Wolverine. In the aftermath, Wolverine tracked the Maximoffs down, discovering that Pietro and Wanda found love "that no one in this world can really understand."
While the Ultimates were already aware of the potential romantic relationship between Scarlet Witch and Quicksilver, Wolverine's story confirmed Marvel's worst romance to Earth's Mightiest Heroes. Hawkeye even tells Logan that he doesn't "want to understand it" and that the affair was "sick." However, he seems more concerned that the media didn't find out about the sibling mutants' relationship - especially after the world learned that Tony Stark and Black Widow had a sex tape. If you think that entire storyline sounds awful, you'd be right. Unfortunately, Ultimates #3 had little to no redeeming qualities as the gross romance is the most remembered part of the comic's terrible storytelling.
Wolverine saw Marvel's worst romance as it was one of the most disgusting things he had ever witnessed. However, it helped the Ultimates confirm what they were up against regarding the relationship between Pietro and Wanda and fighting to recover her body. Still, Wolverine encountering Scarlet Witch and Quicksilver passionately and romantically embracing one another has to be an image he wished he could immediately forget and never have to speak about again.