It's possible you're thinking of a fan-made comic or artwork, or a story that's circulated online. If you can remember any details about the story, like the title or the artist, it might be easier to track down.
It's also important to remember that the portrayal of LGBTQ+ characters in comics has evolved over time. While these characters haven't been explicitly depicted in romantic relationships with each other in mainstream comics, there are plenty of interpretations and fan-made stories that explore these possibilities.