At a doctor's appointment, Sandra Luberc and her stepbrother Tyler Nixon run across Julia Ann. Tyler takes the lead, taking off his pants to let Julia to examine his penis and assess whether he has addressed his issues with early ejaculation. Sandra's annual exam is next on her schedule. Tyler becomes extremely agitated at the mere sight of his stepsister. Julia makes the decision to act. Julia encourages Sandra to feel Tyler's cock and then use slow, deliberate strokes to suck it after Tyler has been stripped naked. Julia strikes Tyler just enough to take his mind off his enjoyment whenever he feels like cumming. When Tyler is prepared to move on to full-fledged sex, Julia assists him in getting at ease on the examination table so Sandra can mount him and get on him like a retro cowgirl. With her augmented enormous boobs and rock-hard nipples hanging loose, Julia gradually sheds her garments as she assists the stepsiblings in discovering each other. Things can get pretty exciting now that Tyler seems to have solved his difficulty fully. After teaching Sandra how to kiss Julia's landing strip pussy, the girls arrange themselves in a double vaginal stack, with Sandra at the top, giving Tyler a selection of tight spots to fuck and fill. Julia lies down and spreads her legs for Tyler to demonstrate his strength, and after he shows that he can do it, Sandra receives the same treatment. Tyler is ultimately given permission to jizz all over Julia's face and Sandra's separated thighs as a sign that he did a fantastic job, even though Sandra is still limp and writhing from her climax. Sandra is given one more lesson by Julia on how to snowball her lover's cum, a raven-haired coed.