I see this going 4 ways.
1) Dude makes his bisexual harem pulling both girls and dudes into it.
2) Both girls fall for him, the "MC" ends up NTRed cause his crush could be one of the girls
3) Both girls fall for him, but the "MC" isn't NTRed cause his crush is a different girl (with the potential of that girl being the "loser" one cause he loves his young years childhood crush that moved away - just that he still didn't realise its actually her)
4) A non-harem ending where one of the girls ends up with "MC" and one with MC creating two couples - technically could split this into two positions - either MC helps "loser" girl get her "MC" by pulling the "winner" girl, or the classical ala Toradora where the "loser" girl ends up with MC who tried to help her cause they both developed feelings for each other, and "winner" tsundere ends up with "MC"