http://www.mangago.zone/read-manga/tsumaranai_otoko/an/tsumaranai-otoko-chapter-3.html
http://www.mangago.zone/read-manga/puchitto_hajiketa/ (not afraid of sex just doesn't want to be bottom because of a traumatizing experience)
Bitter Chocolate Kiss Ch 1: Embraced by a Kind Moon by Yoshino Luca
Bokudake No Peach Sapuri Ch 3: Arduous Love Journey by Hiama Yuki
Masaka no Futariby Naono Bohra
elektel delusion
yaoi manga where in the uke is afraid of sex. ( because it's hurts, or he had some trauma before..