[It's hard to tell whether Ryuutaro is affected or not based on his looks, given he was always perfectly styled and made up, but his voice gave away that he was just as much of a boy as before.
The fortune-teller looked Kaoru over with interest, pleased to see how well the other did with the make-up]

I suppose it would be, but I couldn't tell. It looks like the Author didn't sign everybody up for this interesting experience.