The concept was the uke's sex toy would be link to the seme's dick so when he uses it the seme can also feel, I really can't remember it huhu
i think i know this, but i forgot the tittle. is it this one? https://www.mangago.me/read-manga/saeki_kun_ni_tsunagatchau/
You guys I've read a similar story (fanfic) in AO3 like this too (it was Dumb Husky and His White Cat Shizun fanfic)
Can i beg u for link?…
http://archiveofourown.org/works/25988860