What Is This Sh*t?'s feed

I was reading from another site and as soon I saw that panel where the twins were.. Yeah that. I JUST HAD TO STOP READING AND I CAME OVER THIS SITE TO CHECK IF I'M NOT THE ONLY ONE..

I've seen lots of troupes like this but when the twins like beliteral same blooded twins do each other I just get an ick that I can't explain..