So. First Day is a little 4-parter from June 2008 by coffee_kris. The rating ranges from PG-ish to NC-17, so you can tell where it's heading ;)
Summary: Gwen's first day evokes memories of *Ianto's* first day.
There are spoilers through Fragments.
Read it here in 4 parts
Or here in a single part
Sorry for being so brief this week. Happy reading, everybody!