Amber Summer is trying to give back to the community, so she has volunteered as a Big Sister. She has been assigned to a newly blended family with Kimmy Kimm and Spikey Dee, who are trying to navigate their stepsibling relationship. Amber is convinced that the stepsiblings are fucking, which she finds super hot, especially since she's into Kimmy. As she's trying to figure it out, she tolerates the stepsibs ordering her around more like a maid than a Big Sister.

On her next visit, Amber walks in on the stepsiblings in the middle of Kimmy giving some serious head to Spikey, although Kimmy tries to play it off like she dropped her phone. Kimmy and Spikey eventually coax Amber to get naked as part of her Big Sisterly duties, like massaging Kimmy's tits and serving Spikey breakfast in the nude.

From there, it's only a matter of time before Kimmy gets drawn into a hot threesome with the step siblings. Kimmy finds herself licking Amber's twat and then sucking Spikey's dick. When Amber joins in on the cock sucking, they deliver a double BJ before Amber climbs aboard to ride Spikey in cowgirl. Kimmy tags in for her own stiffie ride. Then she gets on her knees for Spikey to bang her in doggy while she eats Amber out. Amber gets pounded on her back as Kimmy cradles her shoulders between her thighs. When Spikey pulls out to blow his load, the girls take their time snowballing his cum back and forth while playing with the sticky delight.