Natsumi-chan can call Ibuki whatever she likes! I to the B to the U to the K to the I! It's Mioda Ibuki!

[ she's someone that natsumi could have heard of. after all, "afterschool poyoyon hour" was top of the charts for ages, and ibuki was the lead singer and guitarist for that nonsense. her style has...changed, but her voice was beautiful and it was catchy popular garbage ibuki hated but that everyone else ate right up. the super high school level light music club member grins as she bursts into the kitchen, immediately going about opening cabinets and the fridge and drawers to familiarize herself with where everything is. she at least isn't slamming stuff shut, though, since she wants to eat before getting caught? ]

Fuyuhiko-chan has no choice but to like Ibuki, because she's suuuuuuper charming, you know!