Yes!! i love this story!!! and i also love threesome!!! :)) Does anyone know where to find...

Twin lover
http://www.mangago.me/read-manga/kouya_no_seifukuou/tr/41450/page/107/

Hard core heart
http://www.mangago.me/read-manga/hard_core_heart/

Ryoute Ni Darling
http://www.mangago.me/read-manga/ryoute_ni_darling/

Futari no maharaja
http://www.mangago.me/read-manga/futari_no_maharaja/

Futari No Musuko Ni Nerawarete Imasu
http://www.mangago.me/read-manga/futari_no_musuko_ni_nerawarete_imasu/

Glow vampire by Asia Watanabe
http://www.mangago.me/read-manga/glow_vampire/

And a few more manga by Asia Watanabe are threesome too..