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http://www.mangago.zone/read-manga/mihanada_pectolite/ i think?
http://www.mangago.zone/read-manga/pornographer/ this one's a little funny with how he recites erotic stories with a straight face (sadly in seme's pov btw)
http://www.mangago.zone/read-manga/someone_else_s_bl_manhwa/?286E the second couple has a uke that wears a straight face 24/7 and i love him lol
http://www.mangago.zone/read-manga/from_points_of_three/?doj6 uke makes it a point to detach himself
and here are some unexpressive ukes but in seme's pov :(
http://www.mangago.zone/read-manga/heaven_hell_roman_company/?Kryk
http://www.mangago.zone/read-manga/lover_boy_lezhin/?nF0p
http://www.mangago.zone/read-manga/for_your_love/
i hope even 1 story helps
any yaois with an unexpressive uke?
i prefer that the story is from the uke's point of view :)