Erika knows the route to school pretty well. She walks it every day, after all. She could do it almost in her sleep, which means it's a good opportunity to get lost in her own thoughts for a while. Something new and unexpected she needs to pay attention to almost never shows up.
mother is a fraud and a liar that is not a uniform and obviously erika knew from experience that this would be how shinju showed up wait does mom know shinju is a university student aaaaa
Okay, it's fine. She's fine. She's wearing her school uniform to an art gallery and she is Fine. "Hello, Shinju-senpai."
"Hello, Erika-kun." She doesn't seem surprised or disappointed, though. She just holds out a helmet. "It's not too far, but best to be safe."
She nods, possibly blushing a tiny bit, then shoves her own helmet on and swings herself properly onto her motorcycle.
Erika gets on behind her. Now, where is she supposed to hold on...? Waist seems, uh, approximately safe. Ish.
She resettles Erika's hands a bit, so she's wrapped around Shinju a little more tightly.
Right. Right right right. She will hold on a normal amount and be totally normal about doing so. And not be distracted by the differences in the way Shinju smells nice compared to Sailor U.