De profundis (final)

[Seraphim]

Darling boy, whose lips are like summer  like the enjambent into L2 and descriptive shift. ‘Darling boy’ suggests something different the relationship of two young men. How about ‘darling companion’ - S2 will make the relationship clear, and permit an interesting discovery moment in the piece, rather than just hitting the reader over the head with it right away.
Sangiovese, the Tuscan noon
in your wind swept hair, 
go trippingly. Where  I go the construction of the sentence, with all the commas, obfuscated the meaning on the first read.  I had to go back and parse the sentence - imo something that should be mildly edited for clarity on the first read.
the cranes are reeling
blown by winds from the frozen depths. Original take was the cranes were birds, then after thinking about it I decided you meant construction cranes as a nice tie-in to his hard labor in a London prison.  A bit confused I am lol.

I shall try to think of a Maltese sun
light up the sea, on a boat some boys.
Red, malachite, and gold the day.
Their heads are haloed. Golden hay not keen on duplicated use of gold as an adjective
their wind swept locks, they go trippingly
where you go, and I sink deep
into the depths.

Overall I like it. Just picking nits....