Responses
Only one I can think of - http://www.mangago.me/read-manga/isso_koe_ga_nakattara/
Not really a disorder but more a fear,
http://www.mangago.me/read-manga/koe_shika_mienai/
http://www.mangago.me/read-manga/i_m_banging_my_rival_from_a_parallel_world/uu/ibx_chapter-3/pg-1/
Thank y'all so much
Is it a shounen ai?
Would like to read a yaoi with one the Mcs having speech disorder? (Not psychological) and start changing when being his partner