Thor could also be in the mix. His god - like powers and different cultural background compared to Yelena would create an interesting dynamic. Maybe Yelena is initially in awe of his abilities or she challenges him in some way, leading to an engaging interaction.
One great Yelena Belova fanfiction is 'The Red Room's Daughter'. It delves deep into her past in the Red Room and her struggle to break free from its hold. The character development is well - done, making Yelena seem more complex and relatable.
In the comics, Yelena doesn't kill Clint. Their relationship is complex but not marked by such a violent act. There are various conflicts and resolutions, but not this one.