Just watch

You opt not to risk getting caught and instead just fulfill a voyeuristic fantasy. You watch intently as the couple begin to get down to business. They are making out while the young man slips his hand in his girlfriend's panties. She moans and he kisses her neck. His other hand molests her breast while he fingers her.

They move down to the ground and slightly out of view, so you change doors to see in the other window for a better view. He is lying on his back now, getting his cock sucked. You have the perfect view of the young girl's ass as she sucks her boyfriend off. Her head bobs up and down rapidly on his cock and you can even hear sucking noises through the door. Her panties are slightly askew and you can see a hint of pubic hair poking through the fabric.

The young man grabs her by the waist and flips her around so that they are in the 69 position, and removes her panties. She moans with a mouthful of cock and you see her rubbing her pussy on his face. She stops sucking him and leans back, pressing herself up against his mouth and a look of ecstasy is on her face. She cums with his tongue inside her, trembling violently. She gets up and turns around, mounting her man with her sensitive pussy, and impales herself. She grinds into him slowly, but he grabs her hips and pounds into her like any 18 year old would. Her ass cheeks ripple as he goes balls deep in her over and over again, until finally he pulls out and rubs his cock between her crack, spilling cum over her ass cheeks.