Okujima Hiromasa, Takahashi Hidebu, Est Em, Okadaya Tetuzoh, Asada Nemui, Totempole, Kajimoto Reika, Mentaiko (geicomi dj mangaka influenced by famous shounen/seinen stories), Iwasawa Midori, KOIKE Sadaji, ARAI Niboshiko, etc (the space here is limited, so no more creator names)
Also: https://www.reddit.com/r/Animesuggest/comments/17vufpd/are_there_any_shounen_manga_with_bl/?rdt=44199&onetap_auto=true
A very good list from RoseMary: https://www.mangago.me/home/mangalist/226060/?filt
Tired of only finding yaoi manga with an older uke who does not look their age or looks way younger than the seme, even though the uke is supposed to be older than the seme? Then look no further! This list has what you need. An older uke who LOOKS his age and/or looks older than the younger seme.