Romance Vs. Erotica
The purpose of Romance is to tell a story about a relationship and have a happy ending.
The purpose of Erotica is to provide scenes of sexual titillation. You can feature multiple relationships and you don’t need a finite happy ending.
If you do both, you have an Erotic Romance. But it’s still primarily a Romance. You could cut out all the erotic scenes and it would still be a coherent and complete story.
Then you could also have “Romantic Erotica”. An Erotic story with Romantic elements but less relationship or happy-ending focused.
Here are some Erotic stories for you: