Torchwood Fic: They tell me it happened on a Wednesday (Jack/Ianto, Adult, Part I/III)

Title: They tell me it happened on a Wednesday
Word count: ~27,000
Rating/warnings: NC-17, for adult situations, sex, language, procreation and very bad things that happen to good people. 
Characters/pairings: Mainly Jack/Ianto, but there are other characters and pairings that I'm not mentioning here so as not to spoil the story.
Spoilers: Up to "Exit Wounds".
Disclaimer: Not mine, no profit.
Thanks to the lovely used_songs and the brilliant smtfhw , for helping me make this story so much better!  

Summary: "If someone had suggested to Ianto Jones two years ago that he'd end up leaving Torchwood voluntarily he would have laughed in their faces…"
 

( Part I – Prologue + Chapter 1 )