I do not require arm bribery for Levi/Hange things! Admittedly I'd have to go an give myself a bit of a canon review first to brush the dust off, but for more interactions with a Levi, it'd be totally worth it. Anything in particular you're craving to that regard? (Related note: while I default to female due to being exposed to the anime first, I can easily roll ambiguously manga-style if that's your preference.)