Am full of fail because I read this when first posted but failed to comment since I was (happily) incoherent by the time I finished reading...
I love rentboy scenarios and have read plenty in my time, but I don't think I've ever come across one where Draco is all grown-up, and chooses this way of making a living in order to support his son. (The domestic set-up with the secret door/stairs was inventive *and* cosy!) I loved loved loved all the characterisations, especially Sophie, the children, and omg St Thomas! (Is the church based on a real one, in Holborn, by any chance? If it is, I might just go in the next time I'm passing by, and try to find St T!)
Fantastic writing throughout (...Potter's flat is large, but empty, decorated in early divorce. ), warm, compassionate eye for characters, and a terribly exciting crescendo leading up to Draco's realisation that he has broken Teh Cardinal Rule. Thank you for a wonderful read!