Did I just go from tone to age, completely. Yes. Why? Because age matters in sex.
I do not mean the age of consent, honestly, I have no idea on your countries laws. In fact, I am fond of writing teacher/student smut. Yes, this important.
In a lot of my smut, teacher/student, older/younger, incest I guess. The age of the characters correspond with how they have sex.
If the character is an adult, they'll typically know more, and prefer to hold out till they can not stand it. Well a younger character would want to feel that orgasmic pleasure immediately.
A typical tactic I use is to have the older character tell the younger one to try not to cum until told.
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Who would be better at a blowjob, cunnilingist, etc. An older character or a younger one? Generally the older. If the characters are still in highschool and it's their first time, do not make them sex gods with the stamina of porn stars. They are teens. Not adults.
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Smut Writing Tips
De TodoPlease note: This is not the correct way to write smut. This is purely my way and how I write it and what I have learned over many documents. A guide for smut, and I do take requests for specific things.