One of Rizabeau's fics, I think the one that's a sequel of the one set immediately after the prom and Justin getting out of hospital and going away with Brian... I think I remember matching jewellery (anyone know?). Anyway, the sequel involves a renovation and extension of the loft that also includes a really beautiful bathroom. And the bathroom becomes one of the central settings of many key moments. There's a bath in it though, not just canon showers.
Wish I could remember the name... Caprice maybe?
M