Achilles/patroclus, canonically but also somewhat subtly

If you're looking for a poet, Walt Whitman is the traditional gay-but-subtle poet:

From the cinder-strewed threshold I follow their movements, The lithe sheer of their waists plays even with their massive arms, Overhand the hammers roll—overhand so slow—overhand so sure, They do not hasten, each man hits in his place