Insecure Stepsister Gets Some Reassurance

My youthful stepsister has recently turned eighteen and feels quite self-conscious about her body. She wonders aloud if she needs breast implants while letting me grope her perky breasts... it's so bizarre! Later, she's rinsing her intimate parts, and I sneak a peek at her; she spots me and convinces me to lend a hand. We slip into the bedroom where I squeeze her juicy buttocks - we both know this is taboo, but I'm utterly excited! I pound my stepsister's tight cunt and splatter my cum all over it.