I'm looking for manga in which 2 characters are in a relationship, but they hide the relationship from most people. In public, one of them might be socially above the other (boss > employee, senpai > kouhai, model student\class rep\stuco prez > delinquent\otaku\average student), but when there is just the two of them they are equals (treat each other nice etc.). The part about different social status isn't mandatory, they might as well pretend to be strangers or pretend to dislike each other or something else. Extra points if the characters are married and\or were forced into a relationship (arranged marriage), but grew to love each other anyway. 2ir4h

I can think of 3 examples:
14-sai no Koi - secret relationship between model students; extra points for the sweet innocent romance

Oku-sama ga Seito Kaichou! - the setup about being "married" to stuco prez can do, but the manga itself is too close to H to my liking + the harem probably ruins everything in the long run

Onegai Teacher - some parts of this fit (the ones where they act like a loving couple) + they were sort of forced into a relationship, but ended up falling in love

I don't want: hentai, borderline H, smut, shoujo ai, shounen ai

Ai yori Aoshi - landlord and tenant hiding their engagement

Besides the obvious Faster than a Kiss and Sugar Family:

Married:
Conflict Lover - ignore the smut ><
Melodramatic Library - um, spoiler >< but good

Not married(yet):
Sensei!
Umi no Teppen

I also tried this, which turned up pretty good results:

http://mangaupdates.conexionsite.com/series.html?category=Secret%2BRelationship&genre=Romance&exclude_genre=Fantasy_Hentai_Shoujo%2BAi_Shounen%2BAi_Smut_Yaoi_Yuri&filter=some_releases&type=manga&perpage=50

Do Not Fight - They are a ,secretly, married president and subordinate who hate each other but grow to love each other.

Futsutsuka na Oyako de wa Arimasu ga - An adopted daughter and her very young father who are keeping their father-daughter relationship secret and will probably keep there developing romantic relationship secret too.

Himitsu no Ai-chan - I'm pretty sure the female and male mc keep their relationship secret, after they really fall for each other, and continue with their rivalry in public.

Umi ni Ochiru Tsubame - Shikeidai no 72-jikan - 72 hours of death stand (chapter 3).

Ibara no Okite

Remembrance, a forsaken thing that revokes ignorance and leaves people in doubt, is my only redemption and solace deep within the cascade of white.

The evergreen trees speak of days long past when music mingled with the wind and sweet murmurs brushed our cheeks.