[. . . the kiss mollifies the (mild, probably not even real) pout, and he happily lingers in it along with her, hands squeezing hers tightly]

I didn't. . . do it because you were mad.

[not exactly, anyway. though perhaps there were hints of that]

. . . I remember what you said about being jealous. And I thought. . . it might reassure you.

I thought it'd help you believe that even if I had to walk away, I'd always come back.

[that had been the purpose of the kiss. not to insult Akechi, not to merely keep her from causing a scene. but to tell her, without words, that he would always return, no matter what]