Ikumen datte Koishimasu.

From Girls' Generation Scanlations:

Daycare teacher Yui doesn’t really like Rei’s super young daddy, Asagi. But after learning that 24-7 idiotically smiling Asagi is actually a kind and responsible daddy, Yui becomes conscious of Asagi. One day, Asagi collapses with a high fever and Yui comes over to tend to him. Yui ends up kissing Asagi who says in his fever, “stay with me, Yui.” But soon Yui is shocked to find out from Rei that Rei’s mother’s name is also “Yui.”

A love story between an earnest daycare teacher and a cute yet aggressive Papa begins~ ?