Thy bosom is endeared with all hearts,
Which I by lacking have supposed dead;
And there reigns Love, and all Love's loving parts,
And all those friends which I thought buried.
How many a holy and obsequious tear
Hath dear religious love stol'n from mine eye,
As interest of the dead, which now appear
But things removed that hidden in thee lie!
Thou art the grave where buried love doth live,
Hung with the trophies of my lovers gone,
Who all their parts of me to thee did give,
That due of many now is thine alone:
Ironically, the Fair Youth becomes identified with “the grave where buried love doth live”, rather than life and procreation, as in past sonnets. He is the embodiment of the Bard’s past loves and friends. 
 The reference to the grave is one of many in the sonnets. A prime example is  Sonnet 12 .
Sonnet 31