I wouldn't be surprised if it was just a "lucky timing" photo as she was bringing their heads together to whisper in his ear/ let him whisper in hers. I also wouldn't be surprised if it's a kissing photo and again not quite timed to catch the contact. As mentioned, he's certainly up for it, the way he's been chasing her and the way he's groping her ass there.
And your post [lucky timing] didn't help solve the mystery, it just made it more complicated

And I don't like mystery here, I want to understand what happened
The developer used a similar shoe in the first update, which was a one-in-a-thousand chance
So if it turns out that Nicole's mom's and Nicole's clothes that night are exactly the same, it won't surprise me
An optional Female Protagonist's POV would solve these mysteries completely