There are some mangas in this list where they are "fighting" who gets to be top but in general it's a list manly, grown up man having a relationship. I hope I could help you a little bit :)
http://www.mangago.zone/home/mangalist/13228/?filter=&page=1
Thank you! :)
Tanks!
http://www.mangago.zone/read-manga/puchitto_hajiketa/
http://www.mangago.zone/read-manga/seikimatsu_darling/
http://www.mangago.zone/read-manga/t_x_s/
http://www.mangago.zone/read-manga/room_1_2/
http://www.mangago.zone/read-manga/haru_wo_daite_ita/
http://www.mangago.zone/read-manga/kozure_ookami_inoue_satou/tr/134167/page/104/
Does anyone know a good yaoi where both guys want to be on top? So there both like super manly!