All I can remember is that it started out with Tony complaining that none of his past sexual partners could push him as far as he wanted to go. Jarvis catologes this, and later fulfills Tony's desires. He sneakily binds Tony up with cables (tentacles? I don't remember what they were called) and then penetrates him with other tentacles. Also, at some point, Jarvis pulls up a screen so Tony can watch himself get f*cked. I think there is some kind of dirty talk, but not sure.
Please help and if you can't find it, post recs for similar fics.