Penguin Loves Mev
No plot, no sex. Everyday life episodes; straight married couple
Oni to Tengoku Sai
Sane love between two teachers. There're other two with akin title (Oni to...) and same characters. This one is the second in chronological order.
Oni to Tengoku
There're other 2 "Oni to...". This one is the first (how they meet). Sane love between two teachers, but it starts with one of them taking advantage of the other.
Hitori to Hitori no 3650nichi
One main story+a shorter second one. Sane loves. Some sex, but not smut
Doukyuusei Seikatsu
Almost no sex, sane love, green flag. Two childhood friends start living together because one of them is il love with the other one and find and excuse to make him to live with himself
Mayonaka Love Alliance DEEP
Three couples, green flags
How I Attended an All-Guy's Mixer
Green flag, sane love, no sex 3 male friends hang out with 3 female friends who often wear male clothes and wings because of their work in a crossdresser bar. The men are shy and funny, the women are cool
Ibitsuna Bokura no Katachi