If I want someone (in this case, a Professor) to do something for me that they don't need to do (in this case, a second opinion on another Professor's paper), can I ask whether I can "bother them for a second opinion"? The "for" would emphasize that I want the second opinion from the other person, more than "about". But is it proper English?
Google gives a number of results for "bother for", but as always in these kinds of questions, that's not proof of anything except that 94,000 other people may be doing it wrong.