what is considered as cp?

i mean, ive seen a bunch of people saying ybc is cp(i know that its a bad manga in general bc theres rape and shit) but using this same logic would mean that "Blue Sky Complex" is cp...and anyone who read blue sky complex would know that it is 100 times better than whatever ybc is.nonetheless it still shows minors/high school students having sex. so tell me, if ur one of the people who call ybc cp, is blue sky complex also cp? this is such a complicated topic and no one gives straight answers