YaoiPanda

http://www.mangago.zone/read-manga/yuki_no_shita_no_qualia/
I think you should read this and others of the same author =D

my favorites!!
http://www.mangago.zone/read-manga/hana_wa_saku_ka/
http://www.mangago.zone/read-manga/kiraboshi_dial/
(check out her other manga as well! one of my favorite mangakas!)
http://www.mangago.zone/read-manga/hana_no_miyako_de/
(warning: its a sad one but its very goood)
http://www.mangago.zone/read-manga/sorenari_ni_shinken_nandesu/
http://www.mangago.zone/read-manga/yamada_to_shounen/
http://www.mangago.zone/read-manga/soredemo_yasashii_koi_o_suru/
(prequel: doushitemo furetakunai)
http://www.mangago.zone/read-manga/blue_sky_complex/
http://www.mangago.zone/read-manga/manazashi_no_hayagane/
(check out her other manga as well!)
http://www.mangago.zone/read-manga/kaze_no_yukue/
http://www.mangago.zone/read-manga/chiisana_koi_no_melody/
(check out her other manga as well!)
http://www.mangago.zone/read-manga/brother_auto_spot/

http://www.mangago.zone/read-manga/heart_no_kakurega/

The first that jumps to my mind when I think of Slice of Life hahaha

I 2nd "Yamada to Shounen". An extremely heart warming manga with down to earth adorable characters that made my heart swell up with fluff numerous times while reading.
http://www.mangago.zone/read-manga/yamada_to_shounen/
Another one that I would like to suggest is "Uchi no Ouji Irimasen ka" by Kinoshita Keiko. Slice of life meshed with Shounen ai with hearty characters.
http://www.mangago.zone/read-manga/uchi_no_ouji_irimasen_ka/
Last but not the least, "Itsuka Tomodachi Ja Nakunaru To Shite Mo" by Kasa Iuka. My most fav Slice of Life BL. Haven't seen any BL nailing the slice of life aspect as perfectly as this one.
http://www.mangago.zone/read-manga/itsuka_tomodachi_ja_nakunaru_to_shite_mo/
I also recommend you trying the Sugino Akira's Entire Mainichi Seiten series. A great collection of Slice of Life BL with different types of story, last one being my personal fav.
http://www.mangago.zone/r/l_search/?name=Sugano%20Akira

check out my fluff list
http://www.mangago.zone/home/mangalist/7551/

Thanks!! (≧∀≦)

here's my list - http://www.mangago.zone/home/mangalist/26616/