tutututu

Like stepbrothers' relationship? Actually there's another story by Yamamoto Sensei:
http://www.mangago.me/read-manga/bokura_no_negai/

But it's more like Shounen Ai than Yaoi, at least till now.

More:
http://www.mangago.me/read-manga/kyoudai_no_rule/

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

These ones are siblings:
http://www.mangago.me/read-manga/uchi_wa_futago_de_teippai/

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

http://www.mangago.me/read-manga/iki_o_hisomete_koi_o/ << too bad this one is not completed for yet for Eng. But I've read other translation.

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

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

actually there are more... but that's all I can think of, not to mention there're more like relatives, uncle-nephew relationships and such. (▰˘◡˘▰)

And this one... But it's not a healthy, romantic relationship, mind you. (￣∇￣")
http://www.mangago.me/read-manga/kokoro_o_korosu_houhou/

Omg! Thank you sooooo much!~ <333
I completed a couple of them and I'm here like: "what?.. that's all?"
hahaha!
thanks again~ ヾ(❀╹◡╹)ﾉ~