Find somewhere private.

"Let's go outside then," you say. Grace's patio has a small overhang where the others won't be able to see you from upstairs and the privacy fence around the yard is tall enough to block the neighbors.

Sarah looks hesitant but nods her head. You take her by the hand and lead her out the backdoor, closing it softly behind you. The furniture out here is as lacking as the rest of the house, but luckily Grace did get a couple pool chairs. You adjust the back of the chair so it's flat like a bed and then lay down on it. You pull Sarah on top of you into a straddle.

She leans in for a kiss and slowly starts grinding her hips against you as you make out. You're already hard and feeling her press against your cock feels amazing.