Here via the rec at three_settings - which leads to the version you posted at Dreamwidth but I couldn't comment there as I don't have a Dreamwidth account so I poked around here to find it so I could comment, because -

I adore this. Using office supplies for sex is just such a perfect thing for Ianto to do and I cannot believe I've never seen anything like this before! Plus there's all the gorgeous images of Jack all tied up and nipple-clamped and and... just guh.