Sirius couldn't cope with his emotions well, so he writes them all down. Every page is about remus. Remus is never meant to find the book.

When Winifred fell asleep outside, she never expected to be attacked by a vicious werewolf. --- "I don't mind having to be close to you." Winifred said shyly. Remus reached his hand across the table, intertwining their fingers "Me neither." ---- I don't own the H.P. series that belongs to JKR.