From the looks of it's, a typical stray arrogant Marisa goes and assaults a innocent pet yukkuri, this time though, it doesn't care about being a pet itself but simply taking that "Good looking" Reimu as it's wife by force regardless of the Reimu's feeling about it, so it rapes her and rips out the badge with the assumption the mister wouldn't recognize her and would not do anything against Marisa for what it did.
Meanwhile the last panel seems to hint the Mister saw everything and it's ready to show this Marisa a hell of pain.