Technically, it could be any of six possible pairings assuming it is a hetero pairing:
Taichi x Inaban
Taichi x Iori
Taichi x Yui
Aoki x Yui
Aoki x Inaban
Aoki x Iori
However, due to the switching, there's no real guarantee that both characters in that image are (mentally, anyway), opposite genders, meaning any charcter could potentially be with any of the other four in that image, so 16 possible pairings.
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