I can't think of any manga that's so specifically telegraphed an "everyone is together" ending like this one. At this point, it'd be a twist if they didn't and everyone'd be mad.I’m sorry but Takuya needs to end with both of them or none of them. At this point, either of them losing would be just too painful and traumatic.
Both the girls were already such close friends themselves and now they have created this unbreakable, initimate trio with Takuya in the mix which makes the idea of one of them being left out all the more heartbreaking.