I found this fic after seeing some artwork for it on Tumblr and fell in love within the first few paragraphs 
Kakashi being basically drunk when he gets chakra drained is the best thing I’ve ever read, especially when his crush on Iruka shows up because of it. And it shows up in FRONT of Iruka, which is even better. I adore this fic and highly recommend it!
Fic on AO3: https://archiveofourown.org/works/10624245/chapters/23499300