One major problem with trying to determine if you like girls by agreeing to an intense fake-dating scenario for 7 days (assuming that anybody would do something like this in real life, and I mean, real life is often stranger than fiction) is that it may be hard to be confident about a positive result unless you end up liking the specific girl you are fake-dating. So the romance wasn't just an inevitability because this is a yuri manga, but the concept of the test stands on shaky legs because the outcome that Nagi wanted to avoid by insisting on strictly 7 days was likely to occur on Manatsu's side in case of a positive result. Maybe even guaranteed since the test concluded in a weekend of comfy domesticity with lovemaking.
Maybe I would not think about this so deeply if Manatsu did not at least on some level seem convinced that the test was 'real' and not only an excuse for fooling around or for something else. Early on she handily dismissed suspicions of Nagi having motivations any deeper than her own curiosity.
As for Nagi's motivations, I suspect she already realized Manatsu was exactly her type before she made the proposal, and that's why she was so concerned with things "getting complicated". I'm intrigued by the subtle ways in which the two of them are not on the same page about this operation and I really want to see a POV chapter with her...
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