Some girls/women are more sensitive then others, some cum in a short amount of time while others it may take more time then just your 5-10 minute trip down to her lusty mound. Take your time and explore. Watch for how she reacts to certain touches, different pressures and by all means, ask her "How's this feel" or say "oh, you like that" if you get a positive reaction. Or, you don't have to say anything at all once you get that "GOOD" reaction. Practice makes perfect my friend. The right combination of tongue, finger/s and sucking will get you where you want to be... See if you can't manage to get her doing the butt cheek crawl up the bed or across the floor, but don't stop...She'll thank you for it later... At least from my experience...You'll get many good ideas from the folks here, male and female...