The Uke is a daycare teacher. The Seme is the father of a new child entering the daycare. Seme is basically not a father(single) material kinda guy--and he insist that the Uke isnt a good teacher because he is a young man. The Uke tried to prove him wrong by becoming close to the kid and then they start to develop feelings when the Uke became close to the family.
Kodomo x Otona no Houteishiki