Assa, don't be such a slut.
Lol jkjk.
Hmmmmmmm... She either really does have feelings for Fumi and only let the date happen bc Haruna still isn't attractive yet and doesn't think she'll lose him that easily, but got worried when Yoh wouldn't let her come spy on their progress to reassure her confidence, so now she's tryna "beat" Haruna to Fumi. Or, she's lonely and likes the attention and how multiple guys spoil her, even if she makes them wait hours on her ¯_(ツ)_/¯
It's fine tho, lol. Drama is expected. And we know YohXHaruna is bound to happen in the end.
Also, Haruna should've tucked her blouse into the midi skirt. It would've looked better.