Akira was completely confused. But instead of asking a question he was thinking about it on his own. So the 'me' meant having sex. However, as far as Akira knew, sex always involved one party giving money to the other. Then again he didn't want to accept money from Roku. Could it be that he was the one who would have to pay Roku instead? But he didn't have any money. Akira was seriously thinking about this matter while not realizing that he was skipping some essential parts in his thought process. Or that Hiyoko had left already and Roku had come back. Of course, Akira still didn't know what Roku's neko pile work was about either and he didn't lay any connection between that and 'me'.