They’re evil, duh
They will use anything you said against you when it suits them
They will take what you think you might like a tiny bit, amp it up till eleven, and still find a way to make you beg for it
They will laugh at you when you’re vulnerable
They will rub it in your face when you can’t cum in whatever ridiculous way they decided you get to cum
They will hook you in with shits and giggles and inescapable adorableness
They will just sit back and relax till you work yourself up into a desperate ball of frenzy just begging to do what the hell ever evil concoction of depraved things makes them tick, just for their amusement.
Hence the probability of cumming when you think you need to is probably about 0.00392%
I told you, they are Capital E -vil.