Perky coed Lily Larimar is going to school to be a nurse, but she needs someone to help her practice her skills at giving a sponge bath. She can't think of anyone besides her stepbrother, Tony to help her out. Tony is reluctant, but he agrees to strip down and get into his bed with just a washcloth covering his dick. Unsurprisingly, having his hot sister sponging him down gives Tony a raging hardon that only gets worse when Lily's tits pop out of the top of her shirt.

When Lily notices Tony's erection, she says that it's fine, her teacher has showed her how to deal with a patient who gets hard. Putting on some gloves and lube, she starts rubbing Tony off so he'll ejaculate, which will make his erection go away. When Tony can't cum right away, he suggests that Lily show him her tits again. That visual stimulation isn't enough, so Tony makes it his mission to talk Lily into something more hardcore. It takes some coaxing, but she agrees to lose the gloves and to try sucking him off.

Now that Lily is committed, she slowly and shyly lets herself be talked into undressing. Tony can't believe how hot his stepsis is! By the time Lily's shorts and thong are on the ground, Tony can't wait to get her on her back and bury himself in that soft bare twat. Lily gets onto her hands and knees next so that Tony can deliver some doggy style pleasure. Then she finishes herself off with a wild stiffie ride! Watching Lily bounce away on his dick is almost enough to get Tony off, but he holds out until he gets another BJ. Popping his load into his sister's mouth, Tony offers his body any time Lily wants to practice sponge baths again.