3 year old son Tarou

So this Mafia boss is a single father, his wife was killed by a rival gang a couple years ago. His son is 3 years old. His son starts calling this young man (college age) mama as soon as he lays eyes on him (how they end up meeting is up in the air). Because his son keeps calling this young man mama, he hires the college student to be his son’s mama for a year, live with them and tend to any motherly duties. During that time, they slowly start to fall for one another. The son always gets a kiss from his papa in the morning before he leaves for work but the son is all like “papa! Kiss mama too!” so now they kiss every morning because the son demands it.