|Did you purposely choose 14 lines? It reads almost like a sonnet with its similar line lengths. The use of 'D' is quite good and the title is approriate. To set it up as a letter also works well.
Your rhyme scheme is a consitent ababab ... with a mix of perfect and slant rhyme.
Most of your lines are 12 syllables, which is a tad long but a-okay. The 15 sylll. line and short 9 syll. lines jar when the rest of the poem is so regular. It doesn't NEED to be regular, but for this poem evening it out would be better.
Weak adverbs: beautifully, completely, deliberately.
Gerunds: drifting, drowning, breaking, defying.
Be: only one seen, line 4.
Abstractions: love used once
Cliché: light ... shines in line 9.
Idea: the sentiments are well expressed but weakened by passivity.
All -ly adverbs should be changed to more active voiced or concrete (except maybe 'deliberately') adjectives, nouns or verbs.
Gerunds make this seem merely descriptive. In line 10 you write 'drag me' which is wonderful, direct and powerful. Why not: devour, descend, drown, drift, defy, etc.?
Go to the Ideanary to replace common overused words like 'light' and 'love'.
Rhythm: meter and word usage need to be addresed first. Rhythm is merely chosing a cadence (any will do) and maintaining it throughout to provide the poem with an interanl unity.
Your passivity is dreamlike but lacking passion. Dreamlike is good, but a long list of gerunds and -ly adverbs is not.
The sentiments are great, the poetics not as strong. However, it is a very pleasant read, thanks, Kåre.