There is a really sexy shounun ai called Adeken - if you don't mind feminine fellows who cross dress - the characters are pretty sexy, there is just no actual sex ...
And the Kuroneko series (there are 4 or five different volumes - all with names that start with Kuroneko) by Sakyou Aya is very very sexy.
http://www.mangago.me/home/mangalist/36790/ I have some pretty smutty stuff in my list. xD
http://www.mangago.me/read-manga/kaihatsu_muramura_mode/
http://www.mangago.me/read-manga/hatsujou_animal/
http://www.mangago.me/read-manga/fudanshi_kun_no_honey_days/
http://www.mangago.me/read-manga/nemu_is_drunk_hidoku_shinaide_dj/
http://www.mangago.me/read-manga/nightmare_fortress/
These are just a few from my list. Black Sun and Hide And Seek are also good ones. ;D
Try out...
3745HOUSE (or Takeru Mikami) if you're into Gintama,
Micromacro (or Yamada Sakurako) is all around great but I really like their Haikyuu!! stuff,
Psyche Delico,
Watanabe Asia like Ao-mine mentioned I also liked Fallintrash and Cornichon by them, and
Fizzcode if you're into Ao no Exorcist!
donno if all of these can be found on mangago tho!
maybe look at my list:
http://www.mangago.me/home/mangalist/40179/
(●'◡'●)ノ
I really liked those doujinshis. The artist is too good! ლ(´ڡ`ლ).
http://www.mangago.me/read-manga/shingeki_no_kyojin_dj_melt/
http://www.mangago.me/read-manga/shingeki_no_kyojin_dj_dawn/
http://www.mangago.me/read-manga/attack_on_titan_dj_fall/
http://www.mangago.me/read-manga/attack_on_titan_dj_tower/

Hello everybody I'm looking for some motherf**king hot nosebleed yaois where you just want re-read it over and over again...(≧∀≦)
(I think) I've already read most of the smexy ones so I hope you can name me some I haven't read before. Thanks in advance ٩(๑❛ᴗ❛๑)۶