I first discovered my ideal couple after reading this one light novel called The Sovereign of Omnia. Unfortunately, only one chapter of the series has been translated. That was two years ago, and no updates have been made since then. I pretty much gave up all hope for it to get translated once I realized that, so, to fill the void, I tried searching for a similar couple but failed.

To clarify, I'm asking for vanilla romance manga (no harems, no love triangles, etc) where the male and female lead are both very honest about their feelings for each other. As a result, they tend to openly flirt a lot.
I'd prefer the manga to be shounen or seinen, but if you don't have anything that fits either demographic, shoujo or josei is better than nothing. 🙂

Oh, yeah, one more thing. Any applicable light novels are fine, too.

Thanks in advance! . 😀

Excerpt from Omnia to help you better understand what I mean:
(Note: Hina = male lead/protagonist; Suzuri = female lead)

Pouncing on me, Suzuri hugged me tightly.
"It's been troubling me too. So it's perfectly normal for you, Hina-kun who's smarter than me, to feel troubled--Hina-kun, do you love me currently?"
"Of course I love you. I adore you."
"Wow... I never expected these words to be so powerful. Yes, then there's no problem! As long as I know that our feelings are mutual, it's sufficient."
"Huh, you've always been very optimistic."
However.
"But you're right, that's sufficient."
Hearing me say that, leaning her weight on me, Suzuri rocked her body happily.

Futari no Renai Shoka
Sachiare! - slightly ecchi, but it's really tame considering it came out in a H magazine

Ai Yori Aoshi... at least in the anime

DONDAKEE!!