When the story takes place both are already married adults. They met when one was an elementary schooler and the other was a high schooler. Elementary schooler fell in love at first sight and high schooler too kinda. You’ll be able to get a sense from the first chapter is grooming. Older one says stuff like “I’ve raised him well” and that he use to be like a little brother to him. Made me uncomfortable but u do u

For lovey dovey stuff I prefer Eat Me Up, My Husband. The art is waaaaaay better than this, the characters are more interesting, and the smut is delicious!
https://www.mangago.me/read-manga/eat_me_up_my_husband/