This is a search that tends to come up a lot, so I decided to just go ahead and pre-emptively make a master list of Torchwood BDSM stories. Since most of the time the request is for Jack/Ianto, and also specific about who the Dom is, I've split the list into three parts: Jack/Ianto where Jack is the Dom, Jack/Ianto where Ianto is the Dom, and other pairings with the Dom indicated in a note. I've tagged all three lists as follows:
storyfinder:bdsmjackiantodomjack for Jack/Ianto stories where Jack is the Dom.
storyfinder:bdsmjackiantodomianto for Jack/Ianto stories where Ianto is the Dom.
storyfinder:bdsmotherpairings for all the stories with other pairings.
All three lists are consolidated under the
storyfinder:bdsm tag.
( Jack/Ianto BDSM, Dom Jack )( Jack/Ianto BDSM, Dom Ianto )( Other BDSM Pairings )