Eliza Ibarra and her stepbrother Kyle Mason are having an escalating prank war. Eliza sneaks into Kyle's room while he's sleeping and puts a remote controlled vibrator in his pants. She plays with it until he cums. Just as Kyle is waking up from that wet dream, Eliza retreats to her room leaving only the cum stain as evidence. Kyle knows he can't let his stepsis get away with it, so he goes to her room to confront her. He tries to yell at her but holds back out of fear that his mom will hear.
Later, Kyle gets back at Eliza by joining her on the couch as she watches tv. He flips her miniskirt aside and rubs her leg as she pretends to ignore him. Pulling out his dick, Kyle makes sure it's nice and hard as he plays with Eliza's pussy. She offers to give him a handie if he'll leave her alone, but when she gets absorbed in her show her hand job grinds to a halt. Kyle pesters Eliza to continue stroking him off, and eventually she offers to let him fuck her doggy style if he'll just stop bothering her.
Kyle is happy enough banging Eliza from behind, but since she's impatient he tells her it'll go faster if she rides his cock. She agrees, taking him all the way into her trimmed twat and letting him pull up her shirt so he can fondle her titties. Cowgirl and reverse cowgirl both do it for Eliza, who's very clearly enjoying her ride. Her show forgotten, she gets on her back so Kyle can kneel between her thighs and bring her off again. Her meaty pussy is still pulsing as Kyle pulls out to cover his sister in cum. Eliza starts laughing when she realizes Kyle got cum on the couch, then takes off so he has to clean it up alone.