Hola

all of these are historical fantasy manhwas:
1. https://www.mangago.zone/read-manga/preference_for_the_possessor/
2. https://www.mangago.zone/read-manga/i_ll_be_the_matriarch_in_this_life/
3. https://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/

this one didn't start from childhood nor is there explicit romance but it's technically shounen-ai (it's good, i promise):
1. https://www.mangago.zone/read-manga/sankaku_mado_no_sotogawa_wa_yoru/

Thank you!!!