She can’t wait

As she gets closer she tells you she can’t wait and you end up making out, slowly making your way towards sex. Since you both were already naked it didn’t take that long. You quickly put your dick in her, as you do she has a surprised look on her face because she heard herself moan. But what she didn’t know was that you were rubbing her clit so that your tiny dick wouldn’t ruin the moment. You last about 15 minutes , it amazes making her say “wow I thought you were going to last only two minutes” she gets off you and winks at you as she walks away. Knowing that you were watching her walk away she turns her head to look at you still facing her backside at you and smacks her ass and goes into her shower. You wait for her to get out of the shower and when she does you ask her if you have a deal. She looks at you biting her lip and says “sure, if only I can do something before you leave” as she gives you her number. With a confused face you say “sure, what is it?”