looking for a manga

i'm looking for an omegaverse manga where they already had an established relationship in high school and they planned to be mates once they get their secondary gender results. the seme manifested as an alpha and the uke manifested as a beta if i'm not mistaken. this doesn't deter their relationship tho but it has always been in the back of the uke's mind. they still continue their relationship until adulthood and the seme works for a pharmaceutical company i think or was a doctor (i forgot but i'm pretty sure it was in the medical field). the seme meets his fated pair and that was bascially the main conflict because the uke wants to let go but the seme wasn't because he loved the uke, not his fated pair.