Sarah's best friend Amy

"Hey, what are you staring at?" Amy, Sarah's best friend (and secret lover), bumped into her. They were inseparable, and usually left cheer-leading practice together.

Amy was equally gorgeous as his sister. Half a head taller than Sarah, shoulder-length wavy brunette hair, brown eyes.
And she was wearing the same cheer-leading uniform, leaving little to Adam's imagination: Slightly smaller breasts, but Amy was as fit as Sarah.

As Amy's eyes spotted Adam, she realized what was happening: That Adam, Sarah's brother, stood there with his trousers down, stroking his penis. No, not a penis, a cock. A big, fat cock. An incredible fucking huge cock. It was massive! And glistening with precum.

"Wow!", was all that Amy managed to say.

Adam could see how aroused his sister and her best friend already were: Their nipples were poking through their tops, both obviously not wearing a bra underneath.