Bone White and Brittle
“Bolg is my son.” He prodded again, even though the scales of dwarven armour were rather unforgiving against bare hobbit fingers. “He has been my son nearly all his life, as good as born to me. You dwarves respect adoptions as good as blood kin, and you will respect my family in my home, just the same. Or you'll leave, now, through the door you came in.”
On one fated night, Bilbo Baggins finds a pitiful little creature huddled in his garden, bleeding and broken. Adopted!Bolg AU, written for a kink meme prompt.