You are L's girlfriend, the only person to ever love L, and for that he deeply loves and appreciates it even if he finds it hard to communicate that, he loves you and you love him, simple

as you know L is the world's best detective, he would never tell anyone about a case, apart from you of course, L is insanely smart, quiet, mysterious, enigmatic, and highly-esteemed international consulting detective, but when he's alone with you he's different, he is calm, still quiet but he is at peace

he's been super stressed on his biggest investigation yet, the kira investigation, someone, a serial killer has been killing hundreds of criminals without even being at the scene of the crime, L has narrowed it down to a small task force, including, chief Yagami, Watari, Aizawa, Matsuda, and mogi, with you included, his main suspect Light Yagami, you and L heavily suspect light but the others are in denial, you've learnt a lot from being with L, therefore your proving helpful, even if it's just another ear to run things by

it's late and the task force is sat in the hotel, going over evidence so far