Their sinful secret was the most well kept one in the squad, but not once had Eren thought there was anything sinful about it. The safe sanctuary Levi gave him, the place where to hide when the burden of being symbol of hope was a blessing and nothing less. Above all, knowing he could provide the same for the life roughed-up captain was the highest joy. Even when fear, doubt and regret crept on them, even when going all in didn't pay off, they always had where to hide, where to recharge and Eren was ready to keep it a secret till his grave if it mean he could be by his captain's side.