I absolutely adore all the characters from Issho ni Neyou yo! The leads are both so darling but not in an annoying way. I really hate weak characters, and I believe none of these charcters are that weak even though this is shoujo. If someone knows of another manga where the couple is as cute as this one, do tell! I also love the skinship Kohaku has towards Ichiko!

Magico (IWAMOTO Naoki)Although I haven't read Issho ni Neyou yo! I think the couple in this manga is cute

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I love the characters in Dengeki Daisy

Eensy Weensy Monster is absolutely adorable!

The couple in Faster Than a Kiss is really cute; don't even get me started on Teppei.
Though it's a seinen, Mysterious Girlfriend X has two really cute couples.
Maoyuu Maou Yuusha has an unconventional cute couple. Though I should warn you that's not the focus of the manga, the focus is basically economics.
Check out Nineteen, Twenty-One and Gyon-Woo & Jik-Nyu too.

I Second Magico (IWAMOTO NAOKI) and Dengeki Daisy as well.

Thanks for all the suggestions! I'll get started right away . I'm already reading Dengeki Daisy and Nineteen, Twenty-One though, but I guess it's good you all suggested them again since it means I'll like the other mangas too!