Oh me oh my! That was wonderful! I'm embarrassed to say I was feeling a bit weepy at times during this fic. Definitely something I will want to reread again and again. I especially love the line:
"... a rare occasion when two crabs have such an affinity for each other that it's not so farfetched to believe they'd choose to share a shell." And then "Sod the hypothetical. Would you like to share a shell or not?"
Oh man! That just got me - imagining Harry and Snape as two little hermit crabs - funny and romantic all at once. This is a beautiful fic, thank you for a wonderful read! :D