Not being blood related is such a fucking cop-out. You had plenty of other chapters to bring that crucial fact up, but hold out until well into Chapter FIFTEEN? And Gerph has made incestuous content before, so why the hell would he pull a Pornhub and throw in this shit?
Not only the premise of the sex act is fucking stupid and the graphic style is objectively worse than in earlier chapters, but also Gerph put NBR in the setting... The only way this could be fixed is if in the future chapters Dumpfer would tell Skrapne that they really are siblings, but Anais doesn't know that.
I find the idea of the reveal kind of funny because it implies Gerph draws the moral line at incest but then I guess all bestiality stuff he has drawn is somehow fine ¯_(ツ)_/¯