First, choose her traits so they match your play style: if you prefer tenderness, then take the sensitive parameters; and if you're up to temperament game style - take vice versa. That will ease your game a lot.
Two. Follow her needs and try to stay in her tolerance zone.
Three. Let her finish 1-2 times. And then slow down and do not let her do it several times, balancing between 70%-99% arousal.
Four. Her parameters reach maximum tolerance so that you can use the toys to the maximum. Increase the positive effect on arousal by adding toys and intense them, keep adjusting to her needs at that moment.
After climax, her indicators will change, so readjustment is mandatory.
That's the whole secret of reaching 25-30.