Welcome to the demigod school

Piper: Hello class! Today, we will learn how to talk people into doing things for you!
Frost Bite: Like giving you world domination?
Piper: Good idea, but no. Smaller things. Like BMW's.
Happy Camper: BMW's! Awesome! Now I won't have to pay for my car!
SomeRandomMeanGirl(Made Up in this story): Yeah, but what's the point if you cant get world domination? I mean really?
Piper: It's just used for fun.
Booksbedabest: Awesome! Sounds fun!
Piper: Let's get started! First, you want to smile, not a fake smile though. Think of one of your best memories and then use your smile from that.
*Everyone thinks of good memories and smiles*
Piper: great, now, that's a good start. We will start small, and then we will start asking for bigger things. If you guys ever get to go on quests offered by the school, then you can stall your enemy for a moment. It is really helpful.
*IAmAphrodite has a really charming smile, and Piper thinks that she may have charm speak*
Piper: One of the things though that you have to worry about with charmspeak, is that some of your enemies may get mad at you if they find out that you used it.

Notes

Questions:
Name one of the gods/goddesses that got mad at Piper for her charmspeak.
Why do you have to worry about charmspeak?