I don't think he denied it when you read the chapter Yanagi ask if it is a gift from her lover but Naruse answered it's from a friend but then Yanagi said not that the necklace then Yanagi touch it then naruse feels irritated just like what Yanagi think
ooofff im so sorryyyyy My mind went sideways when Yanagi get closerrrr I was ready to fightttt HAHAHAHAHA
I meaaan he did deny it saying it was from a friend but then he couldn't use the same excuse to justify the hickey.
Naruse why deny itttttttt? I understand you babyyy it is hard but YANAGI, I SEE YOUUUU I SEE YOU LOOK AT MR. NARUSE WITH THOSE LUSTFUL EYES YOU NASTY BITCH