Sign
these are the only ones I can think of rn (some aren't super size dif but still tall x shorter)
https://www.mangago.zone/read-manga/hello_green_days/
https://www.mangago.zone/read-manga/wait_in_bed_tonight/
https://www.mangago.zone/read-manga/koi_to_seiyoku/
https://www.mangago.zone/read-manga/koishite_kissshite_kanjaitai/
https://www.mangago.zone/read-manga/give_me_a_hug_mr_frog/
https://www.mangago.zone/read-manga/ashita_ai_kamo_shirenai/
https://www.mangago.zone/read-manga/honey_bear/
(has some homophobia but ML is green) https://www.mangago.zone/read-manga/wait_a_minute_harutora_kun/
Non-toxic size difference bls? I always want to read one hehe