http://www.mangago.me/read-manga/oni_ni_hatsujou/
http://www.mangago.me/read-manga/porno_superstar/
http://www.mangago.me/read-manga/hanagaya_eigyousho_no_kare/
http://www.mangago.me/read-manga/ichiban_chikaku_de_koi_o_suru/
http://www.mangago.me/read-manga/kiken_na_otonarisan/
http://www.mangago.me/read-manga/ikenai_mousou_fudanshi/
http://www.mangago.me/read-manga/hoshii_mono_zenbu/
http://www.mangago.me/read-manga/kaeru_no_prince_sama/
http://www.mangago.me/read-manga/mankai_darling/
http://www.mangago.me/read-manga/aitsu_no_daihonmei/
http://www.mangago.me/read-manga/ikenai_otoko/
http://www.mangago.me/read-manga/ai_no_gebokutachi/
http://www.mangago.me/read-manga/akihabara_fall_in_love/
http://www.mangago.me/read-manga/miwaku_shikake_amai_wana/
http://www.mangago.me/read-manga/sugar_code/
http://www.mangago.me/read-manga/yome_ni_konai_ka/
http://www.mangago.me/read-manga/ikoku_irokoi_romantan/
http://www.mangago.me/read-manga/heart_no_kakurega/
http://www.mangago.me/read-manga/hana_to_usagi/
http://www.mangago.me/read-manga/koi_o_suru_nara_kono_machi_de/
http://www.mangago.me/read-manga/ato_hitoiki_de_ai/
http://www.mangago.me/read-manga/virgin_star/
http://www.mangago.me/read-manga/otouto_ja_irarenai/
http://www.mangago.me/read-manga/yarashikute_ijiwaru/
http://www.mangago.me/read-manga/kouryaku_syndrome/
http://www.mangago.me/read-manga/smile_kudasai/
http://www.mangago.me/read-manga/kuchizuke_wa_niji_no_ue_de/
http://www.mangago.me/read-manga/shitsuji_kyoushi_no_renai_jugyou/
http://www.mangago.me/read-manga/19_days/
Is not exactly yaoi, is shonen-ai but is so hilarious!
These made me laugh:
http://www.mangago.me/read-manga/room_share/
http://www.mangago.me/read-manga/fuhoni/
http://www.mangago.me/read-manga/koi_made_hyakurin/
http://www.mangago.me/read-manga/yome_ni_konai_ka/
You can also try and watch "Kachou no Koi" it's so ridiculous yet so funny and kinda heartwarming. I've watched it 3 times already and it always makes me burst out laughing.
I am so sad a depressed at the moment, are there any yaoi that can help me forget and make me smile and laugh?