Shock

Emma looked shellshocked. She still had some of your cum in her mouth, and looked around, unsure what to do. She eventually spit the cum from her mouth into the palm of her hand.

"That was... my boyfriend never came that much!" She looked down at the semen dripping slowly down her chest toward her bikini top, and brought her other hand up to her chin, like she wanted to confirm the cum that was really there.

"Oh my god John, that was so much! I'm sorry, I couldn't keep it all in my mouth. Was it... I mean, how did... I mean, did I do a good job?"

Your head was foggy, but the post-nut clarity was slowly dawning. In this sweet girl's addled brain, all of this was still all a diagnostic exercise. You needed to keep up your end of the bargain.

"Yeah... um... just a sec." You hopped into the bathroom to get her a cloth. Coming back, you handed it to her and she started to delicately wipe your cum off her chest, working up to her chin.

"That was nice and it felt really good," but you couldn't leave it there. You had actually started to think of yourself as this girl's sex coach, and there were lessons to be delivered. "But, there are some things you could work on."

"Did I do something wrong?!? I'm so sorry!"

"Not wrong, but I think there some things that could have been better."

"Like what?" she asked with genuine concern.