Papa Henshuu Suki Tokimeki Koigokoro

Busy literary magazine editor Kaoru Yuzuki is living a semi-cohabiting life with his beloved son, Minoru, and his partner—bestselling author Taiga Kuroiwa.
Despite the daily struggles of dealing with Minoru’s full-blown “terrible twos,” life feels blissfully newlywed-like thanks to Taiga’s steady support.
But one day, a message arrives from Kaoru’s ex-wife—the very woman who left Minoru behind.
While Kaoru is filled with unease, Taiga is more determined than ever—he’ll never let go of Kaoru and Minoru again...!

(Source: Houbunsha, translated)

Note: Includes one extra chapter.