>>283000051
There are a lot of perception-based abilities in Chainsaw Man. For example Makima needs to perceive herself as superior to someone in order to control them, etc.
Makima had made a contract to negate any "harmful attack" against her by having it be directed to a random person instead.
However, Denji (and the author of the manga) is such a schizo that he did not believe himself to be attacking or harming Makima in any way by consuming her, but rather genuinely saw it as a profession of his love and a way of becoming one with her.
Makima's sister later makes a similar contract but in more blunt terms to avoid the same fate.