Responses
I don't know about a quiet seme but Maki (uke) from "Ousama ni Kiss!" has quite the personality and I love him.- http://www.mangago.me/read-manga/ousama_ni_kiss/
Momo from "Yatamomo" is not exactly sassy but he is not the typical "UwU" uke so you may like him too. His seme, Yata, is kind and I think also quiet but he's like very carnal in bed, still, he's a kind, caring, and loving partner to Momo.- http://www.mangago.me/read-manga/yatamomo/
I've read ousama but thank you for yatamomo :D
Looking for a yaoi with a sassy strong uke like nanao from mujihi na otoko or yu yang from here you are with a quiet seme. :(