I mean... I guess it could be a honey trap, but... what does he have to lose? There's not really any blackmail on him for stoshing this lass, so it cant really be much of a "trap."
Admittedly, I haven't been to Japan for a minute, but last I checked, guys can bang any quiff they damn well please, and Japanese Society doesnt care about them doing so; they might shun the girls for ever having sex other than specifically for making babies, but they generally don't care if guys have sex (I'm not saying that's cool, I'm just saying it is this way; Japan is nearly misogyny-land HQ).
Definitely "Honey;" not so much with the "trap."
Not unless he wants it to be a trap.