Imagine finding an injured black stray cat with green eyes which reminds you of Loki, whom you’ve been crushing on ever since you first met him through the Avengers. You take it in and nurse it back to health, then you decide to give it to Loki, thinking he could use the loyal company and somebody who loves him just the way he is without judging him. A mortal like you, after all, couldn’t be that person, you figured. He would never take an interest in you.
Too shy to personally give it to him, you put the cat in a cosy basket and sneak it into his room on Stark Tower, attached to it a note signed by “a well-wisher”.
A few months later, after both Thor and Loki returned to Asgard, you visit them. Loki’s cat, which he has taken deeply into his heart, recognises you and thus starts at you, meowing and purring, desperately seeking your attention. It’s then Loki realises it was you who introduced him to his fluffy little friend. He appreciates it so much, he slowly starts falling for you.