Your boyfriend Zenitsu always liked sweets.

Everytime you and your boyfriend go out, he always gets some kind of sweet treat, candy, ice cream, something. You got an idea.

Now, before you went to meet up with your boyfriend, you always ate something sweet, thinking that when he kissed you, he'd taste the sweetness and smile. His smile was always sweeter than the candy itself.

At the moment, you were sitting outside by a stream, not too far from the Butterfly Mansion, but far enough that your mind wasn't focused on it. You were sitting comfortably between your boyfriend's legs, back pressed against his chest as his arms were draped around your shoulders, just sitting in comfortable silence before he leaned over, pressing a small, casual kiss to your lips before pausing and pulling away

"Your lips taste... Sweet..." he comments with a small blush, and slight smile. The plan worked.