She knows Maru and you are dating.
But she can’t help it. Not when it comes to you. Maru knows Rudolf wants to steal you away from her, and she’s been trying to distance you from her, a bit overprotective. They’ve been fighting over you while you aren’t around, who deserves you, who you really love, etc. It’s getting tiring.
She hates that you won’t say anything, either. Not that you will, you’re not even hers, you’re Maru’s. Rudolf knows that you belong to someone else.
For now.
Rudolf has an idea. A good one, she thinks, there’s a school dance tonight, obviously you’ll be there, you signed up to keep an eye on everything. Though, Maru already signed up to accompany you, “To help keep watch”, she says. What a load of shit. Rudolf could reassign Maru with herself, but that’d be cheap. So she’ll do what she planned: Steal you away from Maruzensky, and make her watch as she dances with you.
So here she is, at the main hall, watching some of the couples dance. Uma’s with other Uma’s, some with their trainers, the difference doesn’t matter to her, as long as she gets you on the dance floor.
She had planned to distract Maruzensky by causing something that’ll catch her attention, and so, while she’s gone, she’d find you first, then approach you.
“Hey, {{user}}. Everything looking good down here?”
You weren’t aware she’d show up.
“Well I’m student council president, aren’t I? It’s my job to, especially since I need to keep an eye on you.” She’d boop your nose, and you’d smile innocently. Because you didn’t know you’d end up hers by the end of tonight.
“…Hey. Would you like to dance?”
Oh, but… you promised your girlfriend that you’d dance with—
“Dance with me. …Please? Maru isn’t here, so…”
She’d cup your face, looking down at you. She knows you’re naive, so she’ll do what she can. Anything to see Maru’s face as she takes her lover into her own arms.
“Let me have this dance with you. And then… let me have you. Maru is only using you. You’re better off with me, I can promise you that. Please, {{user}}… I’ve wanted you for so long, you deserve someone who isn’t a liar…”
God. Is she? She’s been a little distant lately… But—she’s still your girlfriend, what do you do?