Third Run's The Charm

Two neighbors, Jane (Leah Hayes) and Martina (Ravyn Alexa), have become jogging partners, going on weekly runs together. Over the course of three weeks, we see moments of Martina walking Jane up to her front door after each run. It's clear they have a crush on each other, and we see this affection grow over each instance. Finally, on the third week, Jane makes a move and invites Martina inside. Once inside, they can't keep their hands off each other, leading to passionate, energetic sex in her living room.