Assassin Izuku - Tumblr Posts

Can someone help me find a fanfic? It’s a BNHA one that’s posted on AO3. It involves Izuku being an ex-assassin that gets adopted by Aizawa. Izuku in this fic is selectively mute and communicates through bird-calls. He also really loves bird documentaries.

If someone can link me the name, that’d be great.