This art is based on the story Evermore by Rabiddog on archive of our own It's a damn good story and you should read it it is a SBI royalty au. 

Link to Evermore( If it dosen't work copy and past the link in to a serarch browser):

https://archiveofourown.org/works/31422713/chapters/77715518

Did the second one while tierd so it is not as good