lol, these are the best in my list
by hero
gimmick if u don't mind BL
seconding narabuna kiken!!
Hug! (FUJIWARA Yuka)
Sabaki no Mon
Kuroorihime to Kawaki no Ou
Akai Michi
Half & Half (SEO Kouji) i wouldn't call it as adorable but i like the story
Kawaii Oresama just like the tittle..
Koi (MATSUMOTO Tomo)
Darling Only You!
Ookami Lover *cute*
Meikyuu Yaburi no Hananusubito
NG x Baby
Sono Te wa Atatakai
Maou Voice
[m]Ore no Subete ga Kimi no Mono[m]
Yawarakai Taion lol, BL
Sawaruna Kiken!
Ai Kaimasee!
His Body Temperature, Her Long Sigh it has smut
Kimi wa Seiya ni Uso wo Tsuku
and for the best among the best oneshot (to me).. sheherazade in sheet no sukima lol, it's josei but i love it to death..

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These are pretty good oneshots/single-volume shoujo romance, imo:

Hotarubi no Mori E
Kimi no Kachi

Love<3 They just keep on coming<3

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Hatsukiai
Ano Ko to Boku no Ie
Haruyuki Bus
Onegai, Sensei
Isshoni Ofuro
Hatsukoi no Tsuzuki
Hatsukoi Hakusho
Yuru Koi
Heart no Ousama
Drops (ANDOU Yuki)
Maybe o-o