Wooyobitme's manga / #guys with kids(4)

Shin and Yuuki used to be coworkers. Yuuki is gay and shin is straight, although shin falls inlove with Yuuki and gets rejected because yuuki wont be with someone who isn't gay. He moves to another country and returns after 2 years, when shin comes back he sees yuuki taking care of a child, his nephew. Yuuki became gaurdian and shin now helps him out with raising the kid. Shin tries everything to get together with yuuki and have the 3 of them become a family

Sequel to Itsuka koi ni naru made. Uke and seme have been together now for 8 years, previously childhood best friends who ended up together. Their other best friend shows up pregnant and leaves her baby with them, then leaves for a job overseas. They end up taking the baby girl and raising her as their own. Mom keeps in touch with phone calls but they basically all act like baby girl is the uke and seme's child now. She grows from baby to toddler in this story