Isekai ni Shoukan Saretan da kedo, Nandemo Kennou o Te ni Ireta no de Easy Mode deshita.
TL;DR: Class gets summoned and gets seemingly random jobs; MC gets "Shinsengumi" or something and the power to cut things, which sounds stupid, but is busted as hell because it extends to concepts and basically operates on an "if I believe it can be cut, I can cut it" logic.
To control the boys, the girls are turned into sex slaves by the summoners. MC gets the quiet girl, who ends up with a succubus job. They have
lots of sex and more or less fall for one another. Then more OP people show up and tell MC his ability is called an Authority while trying to suck him into their world domination plots.
He says no and steals their Authorities, one of which he gives to his girlfriend, which gives her delusions of grandeur, so she tries to backstab him, only to get slapped down and mindraped by MC, who does it more as a statement than anything, since it was something he could have done at any point in time, but chose not to.