does anyone know any good twincest aka yaoi with twins, that doesnt have any angst or trag...

Honestly I don't know any off the top of my head but
https://myreadingmanga.info/ will definatly have some

I just read this today
http://www.mangago.zone/read-manga/soukyoku_megu_iroha/
but I don't know what happens in the end

http://www.mangago.zone/tag/twins/

http://www.mangago.zone/tag/Twincest/