Context: a man reads some online posts after accusing another man of being a pedofile.
What is the meaning of 小動物系? Considering the context and the fact that images of young girls came out when I tried to look for it on Google Images, I think the meaning is not simply "small animals system".
Also, could you explain the meaning of 裏ＤＶＤ and "こマ!？"? I think that the first means "illegal DVDs", while te second sounds to me like "really?!". Is it correct? Thank you for your help!