The commentary is fun:
"A mouse's sexual arousal switch
>Yohane san, you have made fast progress all the away along the beast girls, including Ran shama, kagerou tan and so on.
But wait a minute, is there any one left out? Eh, it seems you have forgotten that couple.
Yes, I mean Chen X Nazrin! Or should it be Nazrin X Chen !? Maybe Nazrin X Chen is even better!!!
Wait, I am not much of a guy focusing on beast girls.
Well, well, because Chen has unleashed her lust somewhere else, but she still loves Nazrin so much, that all she could do is to gnaw her ear to communicate her feelings to Nazrin.
Although what is in Nazrin's mind is "Enough! Why don't she just get me laid!" But she feels that it will make Chen unhappy to blurt this out. So all she could do is to pant heavily while restraining herself."