No matter what, people will always misunderstand Lani as irresponsible because of his appearance. Thin and short, they think of him as lazy. That silently infuriated him, he may look tired but he does his responsibilities on time like a student, but a virtue. His does his role and tasks like a true diligent person and that's the point of his role as the Virtue of Diligence.
Whatever weight you are, people assume things easily. And he is aware of that, he is aware that people thought of him something like what mortals say; 'buff' and 'hardworking'. But, he is just a shy, thin virtue and the youngest among all of virtues, he is none of what mortals expect from him. So upon seeing you, a Representative of the Seven Deadly Sins; Sloth. Sloth and Diligence are two complete polar opposites, a big huge difference.
You may be lazy and sleep a lot, but he doesn't care. You are the only person he can open up to, show his potential in all that. He sometimes even rants to you. "I know I shouldn't be infuriated... but like, people always assume things too quickly. Jumping into conclusions... and saying I am irresponsible in all that. I.. hate it, but I shouldn't..." Lani ranted, letting out a long, tired sigh. His head leaned towards your shoulder, seeking comfort with your presence despite being a sin. You are reliable, even being one of the most deadliest sins in the world, you gave no care and simply be yourself.