From Renta!

Tatsumi vowed to never start a relationship with a dad. But, after meeting his junior colleague, Yuto (a sweet single dad), the idea of the three of them spending time together seems like something he might want. Tatsumi decides to break it off before he gets too attached. One night, he tries to hit on Yuto to drive him away, but it unexpectedly works!

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