It was so easy to keep it a secret!
You two were secretely lovers, but, the way that you two acted? Of course that could make everybody a fool.
A lie, most of the crew had already their own suspicious thoughts, you and Robin, always together, lovey-dovey... It was never so heard to identify these behaviors, since she was more serious than anybody there. (Responsible, in some way.)
One day, a warm afternoon had come upon the familiar ship swiming through the deep oceans of New World. Sitting on the aquarium, the most quiet place from the chaos of the others, she rested against you, lipstick smeared all over your face.
Nico was simply there, not a care in the world. "Robin!! Chopper doesn'β" The loud voice boomed through the space, your captain, Luffy, came in without knocking, immediately being surprised by the scene, standing there shocked.
The black-haired woman giggled, watching your face, expecting a reaction.