You can't just say it's because your brother had a gun pointed at your sister Anna the whole time, so she was shy.
However, Rein slightly recalled the situation in the sky just now.
He found Anna to be of the kind that goes soft upon the slightest touch, seemingly extremely sensitive...
"Maybe it's the first time, so she's nervous."
"But it's my first time too, why am I not nervous?" Bo He continued to ask in confusion.
"...."
But after the charming encounter, Rein quickly thought of one thing.
"I have to hurry up and learn the Floating Technique, otherwise, if I fall from a high altitude, I'll either die or be severely injured."
After all, once a battle begins, anything could happen, so it's better to be prepared in advance, just in case.
"This afternoon or early tomorrow morning, I have to make a trip to the exchange hall."
"Exchange the Floating Technique, as well as some rare metals."
...
When Rein returned to the study, he stopped by Jenny's room.