Haley Spades has made up a chart of the sizes of all the dicks she's tried. She's on a quest to figure out the best size, as she explains to her friend Jazmin Luv. Haley's stepbrother, Juan Loco, comes in as the girls are discussing. They tell him this is a project for school and that it's based off real life, which is the best type of project. Juan asks why there are no dicks in the six-to-seven-inch category, and Haley tells him that she hasn't had any. When Juan implies that he falls into that range, Jazmin offers to measure him. Juan is weirded out and leaves.

The girls decide to come up with a way to measure Juan's cock. Haley tries to apologize, saying she didn't mean to make him uncomfortable and that she loves him and his dick just the way they are. When Juan doesn't immediately hug her back, Haley asks if he wants her to prove it. Overriding Juan's weak objections, Haley pops his hardon out and begins sucking it. Jazmin is watching from the doorway and tries to call Haley on her choices by claiming she was joking about sucking Juan's dick. Haley rolls onto her back and peels off her panties to say she wants to see if it will fit in her pussy, too. At first, Jazmin is put off by watching the stepsiblings to at it, but she quickly realizes that she finds it really hot.

Eventually Juan brings Haley off, and Jazmin announces she wants to suck Haley's girl goo off Juan's dick. The girls work together, delivering a joint BJ that just gets Juan raring to go again. This time Jazmin hops onto the cock and rides in cowgirl as Haley rubs her clit. Getting on her back, Jazmin continues to take Juan between her thighs as Haley climbs on top to enjoy riding her BFF's tongue. Haley gets another go with Juan when she gets on her hands and knees, which gets her off and brings Juan to the brink of cumming. He pulls out just in time to bust a nut all over Haley's ass, giving Jazmin a treat to lick from her fingertips and then share with her friend.