Contain the blood; keep it clean. - He lives in the basin, and he is a killer, or this could refer to his blood colored hair and markings
Summer's sun is shining down on thee,- He is sun yellow eyes physical reference
Virginity is indicated by coat so pristine;- His white coat maybe not many scars?
But I wonder, why do you want to be royalty?- He wants to be head assassin maybe?