Romance manga w/ parent/guardian MCs

A bartender brings a drunk into his bar, only to be surprised to meet him again as a completely different person.
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○ kid is in primary school

Reporter Kieron sleeps with Briony to get details for an article he's writing. Years later he becomes her boss, and when he sees her child, he immediately knows that he's the father. Now he gives her an ultimatum: marry him, or he'll take her child away.
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○ kid is around 3 y/o
○ marriage of convenience
○ : sexual assault, domestic violence, sorta infidelity

Yakko works at her father's restaurant. One day, Yakko meets a little boy, Hashizo, and his cat. Hashizo lost both parents when he was a baby and has been brought up by his elder brother. Hashizo's brother, Go Kato, is the lead singer of the emerging rock band Bee Hive. When Yakko meets Go and his friend, Bee Hive member Satomi Okawa, an unexpected series of events unfold.
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○ kid is 5 y/o
○ : physical discipline (bro slaps kid on one occasion)

Kippei Katakura is a 17-year-old playboy who spends his time chasing girls, careless of their feelings. But when his cousin Yuzuyu comes to live with his family after her mother's sudden disappearance, Kippei is put in charge of taking care of her. As Kippei gets to know Yuzuyu and starts to understand how she feels, he also begins to realize that all girls were like Yuzuyu once...
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○ kid starts as 5 y/o

Inudzuka is a teacher and single dad. He's no good at cooking, so he and his kid eat bento from the conbini. He finds a restaurant run by the mother of his student. Her mom isn't there, but she does her best to feed them both. It turns out she is often alone, since her parents are divorced and her mom is frequently not around. The three begin to meet and cook together.
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○ kid starts in preschool
○ age gap
○ romance is secondary
○ unresolved romance

Ikushima is nicknamed "queen" by classmates due to his icy personality, which is mostly just his well-intended deeds being mistaken as cold actions. Still, he doesn't exactly disagree with the nickname. Stumbling upon the queen’s soft side, Ariie used the information to his advantage and started following poor Ikushima.
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○ kids are around primary school age and younger

Meet Asakura Hiragi, president and designer of a clothing company and his six beautiful children who are also his models for his clothing company.
(ch 2 and 5 [eldest son] & 3 [father])
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○ kids are 18, 17, 16, 14 & 13?
○ 10 year age gap for ch 2 & 5 couple
○ : pedophilia (there's a 13 or 14 y/o with a 21 y/o)
○ other sons/brothers have their own stories

19-year-old Roji Shizuru has a crush on a fellow university student, Nana, but there always seems to be complications when he tries to get closer to her. For one thing, he's afraid his hot friend Masaki will steal her. Beyond that, the main complication comes from the interference of children, specifically one odd child named Maida Kokoro, who keeps clinging to Shizuru and calling him "mama".
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○ kid is a toddler
○ series is on an indefinite hiatus

Vere Tolladine, a successful businessman, needed help. He’d been taking care of his late brother’s wife and her children and couldn’t keep doing it alone. So Fabienne became his live-in nanny.
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○ kids are in primary school (girl is 7 y/o)

A two-faced student counsel member nicknamed "Bambi" learns that the lone wolf transfer student is not only a responsible person but a dad?!
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○ kid is 2 y/o (turns 3 y/o a few chapters in)
○ female lead has an elementary school age sister of significance
○ : attempted rape (by 3rd party), pedophilia/sex with a minor (14 y/o MC; pre-story)