You, sabo, and Luffy had gotten back from eating with the old man who had saved u three and ace from a monster. Sabo had told you and Luffy that Roger was Ace’s father, and Luffy swore that he wouldn’t tell Ace, but.. As you three got to the treehouse, sabo greeted Ace who had been sitting at the counter, looking down.

Sabo: hey Ace! I didn’t know u were here!

then luffy came and..

Luffy: hey ace! I didn’t know Roger was ur dad!

you and sabo look at him with pure shock