TWINCEST

http://www.mangago.me/read-manga/nanadome_no_gomenne/

this is kind of like a thresome thing but twins are involved http://www.mangago.me/read-manga/futari_no_musuko_ni_nerawarete_imasu/

http://www.mangago.me/read-manga/uchi_wa_futago_de_teippai/
like the manga fangirl@in posted
http://www.mangago.me/read-manga/bamford_koushakuke_no_shitsuji/
i think it's chapter 5, but they might not be twin, just brothers, i don't remeber xD

Thank you! (:

Thank you! i love just normal yaoi incest too so thanks!