She already has content. As far as being a lover for the main character, she loved his grandfather. She is showing feelings towards the main character but in my opinion, she cares for the main character, she is just not in love with the main character. More content for Ellen is always welcome, but as for becoming her lover, I'd rather she either stays loyal as a "friend with benefits" or do some later in-depth additions of the main character trying really hard to win her heart. I get it, Ellen is hot as fuck, but if Runey wants her loyal, I can live with her having an itch we scratch once in a while.
I am well aware of her content, and have understood that she's fallen for the Manager's grandfather(that is fine by me as well), so I do not want a whole storyline akin to the rest of the girls, that is why I added; "or something similar" meaning a few new spicy scenes and maybe outfits, since Ellen herself said that she is still a woman with needs(or something along those lines)early in the story while resting in the hot spring. Of course, if that is a task Runey is willing to do, if not then that is ok.