I thought we leave such cases as ambigous because
🤨 If you're gonna quote my own words, keep the next part:
which means I'm gonna defer first to what feels most consistent w/ the art, second to the most consistent across multiple, and third to what's most consistent across the story.
Which yeah, I think all the translations are pretty consistent that this is supposed to be subjunctive and the art supports that interpretation.
Not to forget that this chapter is literally them going on a "normal" date.
But has no handholding walk in a crowd scenes, which are a staple of every romance ever including Aya's dream scene.
So why does he refuse if he is in it for sex?
This is why I asked if you could get into the head of an insecure girl. He's refusing the sex b/c he's a decent enough guy to think that she really wants to go to the movie and is just teasing him about the hotel. Which in insecure spiral brain is kinda like how Yuu says yes to a date w/ his kohai or to all the setups - he's a nice guy who will go along w/ things to make other people happy.
"all insecure teenage girls think alike". Especially the ones that are fictional characters written by a male eroge author.
There are patterns that build into behavior patterns that authors rely on to build consistent characterization. Which I very much think Maruto has been doing here - otherwise the characters, especially Aya, wouldn't feel realistic.
She was talking about her family, he definitely didn't intend this as saying she was not serious.
I meant this:
"So yeah, I'll make you my boy toy, and we can just live a carefree life together! Haha!"
"Agh! You're lying again!"
you seem to be missing that she was lying with her back to him in that scene:
Which means Yuu couldn't see her expression, which Maruto/Aya uses precisely for these moments where I think she's dead serious and you think she's obviously joking.
There's also the context, where Yuu and Aya are going back and forth on Yuu trying to convince her this is serious and Aya saying she doesn't believe him & she closes the exchange here:
Yuu: “So, um… what I wanted to ask was…”
Yami: “What?”
Yuu: “This isn’t… just a whim, right?”
Yami: “……”
Yuu: “Like… once we’ve gotten over this, you’re not just gonna…”
Yami: “Don’t worry. Whenever you’re in the mood, I’ll let you do it again~”
Yuu: “That’s not what I mean, not in some casual way like that…”
She comforted me with her whole body after I lost what was basically my first gamble in life.
And she let out her own sadness and pent-up feelings, too.
Yami: “Yeah… I’ll keep being your convenient woman, always.”
We were both people who’d been hurt…
No, putting my pain on the same level as hers would be disrespectful to her.
Yuu wouldn't be the one asking if it was serious if he thought Aya was serious (even though the reader knows at this point that Aya is all in). So Aya is keeping w/ her other responses - which Yuu has been responding to seriously. But decided by the last time that basically she's broken so she can do whatever she wants.
There's no indication here that Yuu doesn't believe her - just that he truly thinks this is what she wants. Which Aya is encouraging by hiding her face while saying it.