Horny or not (which let's face it, what teen/college-ager isn't?) I doubt they'd get past second base like that. Not that it matters since senpai is definitely more gentlemanly and/or clueless than that.
EDIT: Obligatory obvious reminder that we're never going to see that happening anyway.
Lets be honest we all saw that switch up coming but the moment was still tense, I like how this story can be semi predictable but still very enjoyable but tbh if you read enough manga most of them become predictable but that doesn't determine a bad story from a good one.
@uchiha007
"Oh, ok. Here, just bring me like, two and I'll recharge 'em for you, then I'll trade them for two of the stale ones to start again. Good thing i minored in supply chain management. "
Lil bro gonna be devasted when he finds out he is who is his sister so and the thought of what is going into her. Then Hana is gonna be pissed if she finds out lil bro saw it first.