Yes (and have a plan for Sarah)

You think about it. If you leave Sarah's house by 6pm, you could get a shower, eat, and borrow the car to pick up Rachel by 7pm. The best of both women!

"Sure, but how about picking you up at 7pm? We'll still have time to get to the theater to catch a 7:30pm movie," you ask her.

"Okay, that works for me," she says enthusiastically. "I'll see you then." She then walks off to catch her bus.

You quickly finish dropping off your stuff and head out to the parking lot. There is Sarah waiting by her car. Luckily, the parking lot is on the other side of the school from the buses, so Rachel has no chance to catch you. As you walk up, Sarah steps forward and puts her arms around you, giving you a big kiss. "I'm glad you made it, Big Boy. Let's get stoned again and get home to my house." She hops into the driver's seat.

You go around the car and get in the other side. You pop open the glove box and retrieve the Altoids box, whipping out another joint and the lighter. She pulls out of the parking spot, and quickly exits the lot. You fire up the pot cigarette and take a very long, slow drag off of it. You let it out just as slowly, as you hand it over to Sarah.

By the time she drives into the driveway of her pleasant house and into the garage, the two of you are pretty well-toasted from the marijuana. You are giggling at each other as you both tell about what happened at school in the afternoon. You don't mention Rachel to her, and you concentrate saying on how much fun you had in the morning and at lunch with Sarah. For part of the drive, she had her hand in your lap, gently stroking your penis through your pants, and occasionally, she would rub her tits through her thin tank-top. The second time she did that, you reached over and helped by lightly pinching her nipple closest to you. When you get out of the car in the garage, you come together into a tight clench, kissing each other hard and deep with lots of tongue. Your hands roam over her body, paying particular attention to her ass and tits. You both are very worked up in a short time.

Sarah breaks the kiss and grabs your hand, leading you into the house. "Hello! Anybody home?" she shouts to the house. No response comes back. "Oh, goodie. It seems like we're alone. Do you want something to drink? Maybe a beer?" she asks with a grin on her face.