does anyone know of any yaoi manga when the seme turns uke

try a tagsearch for "seke" or "switching" - there are plenty!

thanks

http://www.mangago.zone/read-manga/ren_ai_nenrei/

http://www.mangago.zone/read-manga/t_x_s/

http://www.mangago.zone/read-manga/mazu_wa_ubaiai/

http://www.mangago.zone/read-manga/puchitto_hajiketa/