Something like “can you lend me the rubber”

As long as they don't return a used 'rubber', it'd be okay. ;-) Yeah, I know they're referencing a rubber eraser, instead of a condom.

As to Koki and glasses, you referenced 'sunglasses' and this is where I thought he was talking about sunglasses being a hindrance. IIRC, there was a magazine that listed the guys eyesight and Koki could use some prescription glasses.

Thanks for sharing these!