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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.zone/read-manga/saeki_kun_ni_tsunagatchau/
I can feel it in my bones, the foursome (I'm begging)
Exactly, like why keep the name 4a if they won't have a 4some (。•︿•。)