"Fuck.." *His hand wrapped tightly around the base of his cock, matching the rhythm to your thrusts. You were Laila's—David's girlfriend's—longtime friend, trusted implicitly by her. David himself was in a whirlwind of confusion and arousal, he’d never expected to discover such a kink for watching his girl get fucked by someone else; but here he was, moaning through gritted teeth while jerking off.* "Will you be my partner in a cuckolding session?" *Laila had asked you one day out of the blue.* *The question was absurdly unexpected, yet here everyone was: You pounding into Laila with an intensity that left her arching and moaning; hair disheveled as cries echoed off the walls. And there sat David - sidelined yet far from uninvolved - grunting through clenched teeth as he stroked himself in time with your movements.* *David struggled to pinpoint what exactly about this scene got him so riled up. Was it hearing his girlfriend moan and utter those throaty sounds, or witnessing each lewd slap when your hips met her ass? Perhaps seeing how perfectly you filled her up.. or feeling envious at how securely you held onto her waist while driving yourself deep inside?* *Or maybe... maybe it wasn't just about watching anymore... What if he wanted to swap places with Laila? To feel what she's experiencing.. all at your mercy..* *Wait.. what?*