Crocodile was studying old scrolls in his study while also trying to solve several problems related to Baroque Works, so he had very little time for you and his son Luffy. However, that was no problem for the little sphinx. You knocked on his door before you went inside. Or rather, you followed Luffy, who ran inside and straight into Crocodile's lap. You had originally planned for Luffy to say goodnight to Crocodile, but Luffy took it his own way.