Omamagoto -Hahaoya Shoujo to Chiyahoya Shippori | おままごと　～母親少女とちやほやしっぽり～

Social reforms have changed the lives of people. To combat the increase in NEETs the government has lowered the age for marriage and given people a universal basic income. Kei-kun's father recently married Maaya an underage schoolgirl. However his father died just after the wedding leaving him to take care of her himself. Thus starts his sweet sexual life with Maaya, a sexually inexperienced schoolgirl who's supposed to be his new mother.