FYI you nerds just sound inexperienced fixating on the 30 seconds thing. If they were already hot and heavy for a while it's not weird to blow immediately if your whole goal is just to blast custard, ie the entire point of settling for oral with a girl who's about to blueball you otherwise. I didn't bring any graphs but one day when you have the sex you will discover there are whole plateaus and dips to the thing and you can decide to get off at one station or wait for the next, it's generally a choice.
And she's probably lying about what they were doing up to then anyway.
And she's probably lying about what they were doing up to then anyway.