The book was QT, and one of its arcs had the ML being a researcher and he made robots to comfort him. Then the MC just barged in his lab one day and then pursued the ML(?) I think, but the ML was like hell no I don't trust you so let me insert this thing into your body so that you completely belong to me. And then the MC was like no don't you dare, but eventually the MC won over the ML and the ML was a uke o.o but in the past stories the MC was also a use so yea that's all I remember TvT