Yeah but remember in court he said that Toni must have been fantasising about killing Alesha, and it seemed like he was actually talking about himself here (re: fantasising) so I don't know if I can believe him now he's saying it was just acting on thought in the moment - it might be, but I take what he says with a grain of salt, even the stuff he's told the psychologist or whoever he spoke to professionally.
Also I remember when his youtube was up and in one of the comments he was writing underneath it he was talking about doing things to his cats that made them terrified and he was talking about their hearts thumping or their adrenaline pumping and being scared - and he sounded so gleeful and happy about putting them through this...so I do believe he gets off on terrifying his victims. He was putting the cats through something that scared them and it was purely to give him pleasure. I think he can both get off on scaring someone and causing them great pain, as well as get off on having sex with them after they are dead. He can take part in both those kinds of things and enjoy them.