Analysis of Sonnet XIV: Youth's Spring-Tribute

On this sweet bank your head thrice sweet and dear
I lay, and spread your hair on either side,
And see the newborn woodflowers bashful-eyed
Look through the golden tresses here and there.
On these debateable borders of the year
Spring's foot half falters; scarce she yet may know
The leafless blackthorn-blossom from the snow;
And through her bowers the wind's way still is clear.
But April's sun strikes down the glades to-day;
So shut your eyes upturned, and feel my kiss
Creep, as the Spring now thrills through every spray,
Up your warm throat to your warm lips: for this
Is even the hour of Love's sworn suitservice,
With whom cold hearts are counted castaway.