Ok, I have to comment here, this was absurdly hot! Raven is already one of the hottest characters out there, but seeing her getting fucked and impregnated by her own father, is crazy hot!
Although I'm not really a fun of the whole cuck/humiliation stuff, so for me it would be better without that, but I can understand why you wrote it that way, Trigon is a villain after all.
The only thing that was a real turn off to me was Trigon telling Raven he would kill her when she got old, I mean, the guy has magical powers, he surely can find a way to keep her young forever, so there's no need to kill her.
Other than that, the only way this could've been hotter would be to show Raven and Starfire giving birth to their daughters, and an epilogue with Trigon fucking and impregnating the daughters he had with Raven and Starfire.