It's a trap...
Illuminati, heh I guess they couldn't chose anything else.
Manga reading list: Bleach, Naruto, Katekyo Hitman Reborn, One Piece, Code Breaker, Gamaran, Kuroko No Basket, Fairy Tail, The World God Only Knows, Kimi No Iru Machi, Good Ending, Medaka Box, Nisekoi, D.Gray-Man, Ao No Exorcist, Freezing, Magi - Labyrinth of Magic, Soul Eater, Rosario Vampire Season II, Iris Zero, Ubell Blatt, Bloody Cross, Sun-Ken Rock, and Infinite Stratos,
I'm pretty sure that Satan is observing through his eyes, but perhaps it only activates when the MC unleashes his true form.
It's understandable that Yukio could survive while being in the same womb as a half devil, but isn't it strange that the MC didn't burst out his flames ? Or, if he in fact did, how come Yukio was resistant to it ? Isn't it strange that both of them survived, while their mother was burning from the inside while being possessed by Satan (it was like that IIRC ) ?
I have missed too many chapters on this.
Time to go on a reading marathon.