read A Good day to go crazy - its not too fast paced but not too slow either and has good plot as well as characters ^^
http://www.mangago.zone/read-manga/all_about_lust/?av=1
Don't let the title discourage you - it's a story of two couples and their different takes on love - whether is sexual or platonic. Nicely paced and characters are well developed. I really liked it ;)
A couple of suggestions:
http://www.mangago.zone/read-manga/blue_sky_complex/ ... a really good shounen ai to yaoi feel with this one.
http://www.mangago.zone/read-manga/asatte_ni_kiss/
http://www.mangago.zone/read-manga/koi_nanka_shitakunai/
Hush (today) + my last love scenario
Hi! This is actually my first question ever - I'm looking for some yaoi manga's were the sexual stuff doesen't happen too fast, kinda like Shounen Ai in the beginning and then yaoi later on. Examples: "Cherry blossoms after winter" and "Hana wa Saku ka" but maybe not that slow of a relationship development. But all suggestions will be appreciated!(: