I don't believe it!
Average boy would not crossdress no matter what.
Even Takanashi-kun was struggling a lot, while he had a powerful reason to do it and two oppressive annoying characters instead of Najimi.
I mean, why did you do it, Tadano-kun? You didn't have to, you could endure any pressure, and still reject in the end.
It looks unrealistic, first time in series. The so-called "author's will".
Apart from that, I can understand that uncomfortable feeling of Shousuke. And I was impressed, how fast Tadano-kun's imouto made that photo, sent it and made a call