Though Yukimura and Himuro went as far as to kiss for the experiment, they were soundly beaten by Chris and Suiu's oxytocin levels in their saliva. Panicked, Yukimura suggests that they conduct control experiments. However, in the midst of the Yukimura/Suiu pairing, Suiu's seductive manner ends up causing Yukimura to ogle her charms. Seeing that, Himuro runs another experiment with Yukimura, but ends up sulking. The two end up having a lover's quarrel. Yukimura's behavior causes Chris to look down at him coldly and say, "As a man, you are a failure."
but you can't even express 
your own feelings clearly.
.لكنك تعجز عن التعبير عن مشاعرك الخاصة حتى
doch du kannst deine Gefühle
nicht einmal klar ausdrücken.
ma tu non riesci nemmeno
a esprimere chiaramente cosa provi.
mas você não é nem capaz de expressar
seus sentimentos de forma clara.
а ты даже не можешь открыто
выразить ей свои чувства.