@litinz all the more reason he passed with flying colors. While exhausted, and behind schedule, he went out of his way two different times, one of which while carrying somebody and declined repayment in the other. I'll give you the other one because it's possible his exhaustion impaired his flirt radar. It would have been much easier to just pocket the wallet and bring it by when he wasn't behind schedule another time, or at least tell yourself that.
@Psychronia based on the convo between the two after Kuroki left, she's the lesbian succubus's human client. That said, if he was gonna fall to succubus seduction, he would have lewded long ago.
Also, it's pretty clear that they're more dream demons than lust demons by this point, in spite of the aesthetic, if Lily's getting kudos for her work with Kuroki in spite of zero lust being involved.