Carissa is a wealthy widow who has a reputation for being a highly sexual and very seductive woman. When she first meets recent high school graduate Mark Richards at a hardware store, she asks him to help her install a shower head.
Mark is instantly taken with Carissa's looks and, when she seductively invites him to shower with her, he agrees, leading them to have several rounds of passionate sex. At first, Mark keeps his relationship with Carissa a secret from his overprotective mother Tanya, but she soon finds out while looking through his phone.
Carissa comes over for dinner and Tanya is shocked by how much older she is than Mark as she is After an awkward dinner between the three and Tanya's aquarium dco-worker Randy, Tanya finally gives Carissa a piece of her mind, saying she disapproves of the relationship and refuses to let her seduce her son. Carissa leaves, angered by Tanya, and Mark apologizes. Carissa then asks if Tanya has total control of Mark and he says "No" before they go back to her house, much to Tanya's shock.
Mark stays the night, having a sexually intense encounter with Carissa in her pool. The next morning, Tanya comes over to try and reason with Carissa, having learned that her husband had died in a freak accident, but she becomes hostile and accuses Tanya of trying to control her son so she won't have to be alone. She then says she plans to get Mark to cut her out of their lives forever before shutting the door on her. Soon, Carissa's darker side manifests itself, as she tries to convince Mark to move in with her and becomes tense when Mark shows reluctance.
This comes after a man at a club warns Mark to stay away from Carissa. In an attempt to rid Carissa from Mark's life, Tanya sets him up with classmate Melanie, and the two go on a good date. Unbeknownst to Mark, Carissa is watching them and, after the date is over, surprises Melanie in her car. She duct tapes her mouth shut and taunts her for trying to steal Mark from her. She warns her to end things with Mark and cuts her face with a knife to show she means business. Mark then tries several times to video chat with Melanie, but she refuses.
