[ He wasn't going to let this go, so he perks up when Shuichi takes the bait easily enough -- making it partially Shuichi's idea is the best scenario. Ouma figures he's probably also suspicious, but as long as Shuichi's curiosity is surpassing that, it's fine. ]

O-kay! If it's investigating, I'd prefer to do it with you, anyway.

[ Obviously there's Shuichi's inherent detective skills and thirst for solving things to value, but Ouma naturally can't just leave it at that. ]

... 'Cause if anything bad happens, you're my number one meat shield for sure!

[ Being sensitive to the mood?

Ouma doesn't know her. ]