I was wondering if anyone has recommendations for a manga that has romantic tension, where there are two characters who like each other, but are not together for whatever reason.

A few scenarios to give you an example of what I mean are when:
a) two main characters are extremely tense around each other. (i.e. avoiding eye contact, gazes etc)
b) two characters avoid the issue altogether (as in,act normal) but nevertheless remain tense.

A few stories like this are Tramps like Us, where there is the issue of romance but it is avoided by two main characters (who live in a "master/ pet" type manner). Another example would be unbalance x unbalance (the only ecchi manga that I've actually ever liked): where there is tension between the two main characters (student/ teacher relationsip), although it is mostly avoided by one side of the party.

It would also be great if the stories contain romances that take time to develop, as with the two up above. Although the mangas are nothing like each other 🙂 .

Hope my crappy explanation makes sense and thanks for any suggestions.

Suzuka
Black Lagoon has tension tough romance is not the main point of the story

Not sure about this but maybe you should check out Kimagure Orange Road. It's kinda old though.

Don't only look straight, look also to the sides, usually the essential isn't in front of you, but beside you.
-7

Akuma de Sourou
Hot gimmick
BxB Brothers
Kimi ga Suki

never fr0wn cause you never know whos in love with your sm 🙂 e
Your mind is like a parachute it works best when its open

Koi Kaze
Three cheers for incest!

poof "SHOUJOMAN IS HERE!"
Just Lynz, drop the -ajw

Lament of the Lamb
I"s
D-ASH
Ichigo %100
These are all seinen/shonen btw
I"s and Ichigo 100% are ecchi.
D-ASH has minorly pornographic moments, but little ecchi/hetai content
Lament of the Lamb has sugested incest, but its so beautiful and sad....

Special A..

it has alot of romantic tension..the guy is in LOVE with the girl and does things just for her and goes like CRAZY worrying about her and she just thinks off them as rivals, shes pretty stupid to his love