**if possible***
There's no double penetration that I remember... but attends to almost all pre-requisites. 2 seme (brothers but no twins), 1 uke and sexy as hell.
http://www.mangago.zone/read-manga/pet_keiyaku/
Go here for more double penetration ;D http://myreadingmanga.info/black-monkey-pro-banana-jam-reward-cg-uncensored/ (There's a tag~)
Once I saw one just like your description, but no twins, I searching for it right now.
i'm into double penetration. you better go to my threesome list. (still under construction but there's quite a few of them now) i've marked it there as DP. http://www.mangago.zone/home/mangalist/84846/
Futari No Musuko Ni Nerawarete Imasu
is the one you are looking for! its amazing!
"there's no way that this is fate " manga
"Eunsoo's good day" the seme are twins. Tho it still on going sooo im not sure if it has. Im also searching for this. T.T
yaoi mangas that have 2 seme (prefer twins) and 1 uke , is possible there is a double penetr....n (am too perverted >_< ) thanks