Kiss yori mo Hayaku, Dengeki Daisy Recommendations
In both mangas, there is an older guy that protects and an high school girl that is protected, making the relationship between them really sweet. Also, both Kurosaki and Kazuma like to tease the girls so it is really funny to see the way the girls react. Another similarity between both male characters is that they are always trying to control their feelings and impulses because of the age gap...(In Kurosaki's case, he also doesn't want to be called a lollicon XD)
Both of the stories are about high school student falling in love with 24yo guy whom she know in school.
Ftak feels like Dengeki daisy with lesser plot, more fanservice but more enjoyable.
older guy, fierce lady, school girl,