Unintentional discovery of teenage stepdaughter's nudity by overly cautious stepparents

A 50-year-old stepdad, overprotective and possessive of his 18-year-old stepdaughter, stumbles upon her in a compromising position. His anger turns into arousal as he joins in, leading to a steamy encounter. The teen, inexperienced yet eager, indulges in a wild session that ends with an explosive climax, blurring the lines of taboo.