I really don't like this twin trope. Fraternal twins and identical twins are completely different things. They teach you that in freaking middle school.
I don't really understand the last panel. Someone is holding the other's feet with one hand, and their other hand is holding the hand holding the feet?
What's with the random Chinese patriotism? Also, learning more than one language is beneficial for children, and wouldn't make them better or worse at one or the other if learned correctly
If she was his sister he would boast about her being in erotic magazines?? No the fuck you wouldn't. If my sister had this type of job I'd be super disappointed