Shinkuu Yuusetsu
This one's a very interesting read. It's about a country where everyone is matched with a lifetime partner when they're 3-4 years old. However, being partners is different from being married as you can have both a lover and a partner (but your partner is always your most important person). Furthermore, no one places priority on love and romance, so even if two partners have have sex or develop a family, their relationship is still more platonic than anything since it comes from the mutual understanding and acceptance that they will always be together until they die.
Kekkon Shite Kudasai!
A p cute omegaverse
Kazoku Ni Narouyo
It's wholesome. A gay couple raise their childhood friend's (who is like a sister to them) kid since she's a war zone photographer and is always away in foreign countries. It's a cute dynamic of a girl being raised by 2 dads and a mom.
Yozora no Sumikko de