While I agree she's the most likely, I don't think there's been any romantic interest shown from either of them. Or anyone else for that matter. There's been no romance at all, which I'm ok with.
Take a bone, leave a bone.
I don't understand why people are blaming Yom. He just draws it. Surely he's not the one deciding what makes it into the manga version and what doesn't.
She can create the items but it doesn't say anything about her being able to give them the effects that they have, so I doubt they came from her skill.