onehellofajellyfish
A Finny and Ciel Phantomhive character study fic set during Blue Revenge Arc, has spoilers for Emerald Witch Arc and Blue Cult Arc in particular.
"I only learned how to be gentle because of you, young master. Thank you."
"Even if I am the reason why you cannot be gentle all the time?"
Ciel's question was barely a murmur in his ear.
Finny leaned his head against his master's, inadvertently lifting Ciel a couple inches off of the floor so their heights matched. "If I have to be a weapon sometimes, I'm glad it's to defend you, sir."