Midnight Conflict Thank You

As they continue living together, Kousuke and Atsushi begin to feel a growing desire to become “family.”
Excited to move forward toward “marriage,” they are all smiles at first, but a misunderstanding quickly comes to light.
On top of that, Atsushi receives a proposal for a job transfer...!?

(Source: Kadokawa, translated)

Note: Includes one extra chapter.