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there you go:
-"The Komukai Houshold's Circumstances" ( http://www.mangago.zone/read-manga/nennen_saisai/ ) *chapter 2
-"Ikumen After" ( http://www.mangago.zone/read-manga/ikumen_after/ )
-"Sannin Gurashi" ( http://www.mangago.zone/read-manga/sannin_gurashi/ )
-"Yozora no Sumikko de" ( http://www.mangago.zone/read-manga/yozora_no_sumikko_de/ )
-"Work In" ( http://www.mangago.zone/read-manga/work_in/ )
-"Seishun Catharsis" ( http://www.mangago.zone/read-manga/seishun_catharsis/ )
hope you haven't read already :)
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A tag search brings up a lot of heartwarming yaoi childrearing stories:
http://www.mangago.zone/tag/children/
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Takame's BL with childcare / LGBT parenthood
http://www.mangago.zone/home/mangalist/24154/
Yaoi manga with seme/uke raising children? Something heartwarming please <3