From Exiled Rebels Scans:

Yura, who picks up his nephew on the way home from work, has a natural enemy: The blunt and unsociable preschool teacher Kaji. Despite his kindness for the children he teaches, Kaji hasn’t a smile to spare for the guardians who come pick them up. Overlooked by the gay Yura, whom has a heart breaking history with his past boyfriend. When Yura’s unrequited love silences him, calling him a “bastard homosexual” Kaji steps in to protect him, pretending to be his boyfriend?!

The love between an unsociable preschool teacher x salary man

From Exiled Rebels Scans:

Chapter 1-3: Hagiwara Tatsumi is given three tickets to a super hero show geared towards children from a client at his job. When he is complaining about the fact that he will never use them, he meets Maki Yuuto, who asks if he can take them for his son.Tatsumi admits he is gay, and only has one rule: Never fall for a man with a “home.” But then Tatsumi meets Maki Ritsu, Yuuto’s son and breaking his rule, by falling for a man with a home, seems like the most normal thing in the world.

Chapter 4: Jun and Kazutaka have been dating for two years when Kazutaka asks Jun to live with him. The two work together and during one night of drinking, Kazutaka finds out that Jun becomes a kissing demon with any intake of alcohol!

Extra: Kiss Akuma wa Hyakumankai Ai wo Chikau