What is the tone of "the 18th sonnet" by william shakespeare? or what is tone?

When you talk about a person's tone of voice, you're talking about the mood or the personality traits that come across when the person speaks. Same deal with the tone of a poem. It might sound cheerful or mournful, affectionate or insulting, humorous or serious, confident or shy, etc. In this poem, the speaker is addressing somebody he loves. In what "tone of voice" would you say he's speaking to that person?