Sentimental porn:
Porn that is strongly influenced by emotional feelings, especially about happy memories of happy events.

In short, porn that not only erects the penis in your pants, but it also erects the penis in your heart.

Case and point:
Teaching Feelings
A porn visual novel where you play as a doctor that helps a former slave to regain the ability to live a happy normal life. And thanks to Florence Nightingale Effect the girl does find a happy life.

The only flaw in this show is that the manga author can't keep his fetishes out of his SFW stuff.
Thus, Shouta and Lucoa situations, along with the smol loli being very visibly aroused by Kanna.