Yeah, your screenshot shows the only answer you got here.
Then, you shall go Friday Night at the School Pool, choose the Romance Branch, and after that go Home and sleep, forward time until Saturday midday, and go to the Beach, you should meet her there and have the possibility to continue blackmailing her.
Choose 1, then 2 on these choices (there's more dialogs than those 2), and you'll end up with "Corrupt her further." as Meiko task onto your dairy
