yaoi threesome where the uke is entered by more than one seme at a time;)

http://www.mangago.me/read-manga/oshioki_gakuen/
http://www.mangago.me/read-manga/goshujinsama_to_wanko/an/goshujinsama-to-wanko-chapter-7.html

http://www.mangago.me/read-manga/sex_therapist/an/sex-therapist-chapter-7.html/2/
Just keep reading ^.^

Koisuru Omocha Ch 5: Servant of Love by Akira Rika
Nurse ga Oshigoto Ch 6: Yokubari wa Dame na no by Hoshino Lily