Nagatoro is still torturing Senpai, laughing at his choice of manga and at how he talks to girls, and trying to get a reaction out of him by having him put her stockings on her.
Seriously?
بجدّية؟
Oh, ernsthaft?
¿En serio?
¿En serio?
Nan, sérieux ?
Oh, davvero?
Ah, sério?
Что, серьёзно?