I feel stupid for not realizing what happened in this strip. Basically NTW was trying to do that scene, except that SASS turned toward her during the jab, making NTW jab SASS' breast instead.
Senpai what's with you!
Usually, I'd translate it as "Senpai, what's wrong with you!" since NTW is clearly embarrassed here.Seems interestingSenpai, how should this bepomfHa?