You fuck amazing but why am I cumming out?

A woman with a heart tattoo on her left buttock is on all fours on a green bed, being penetrated from behind by a man in green shorts. He grips her hair and hips as he thrusts, her body moving with each stroke. The scene shifts to her sitting back on him, then returning to doggy style, his hands roaming her back and ass as they continue. The lighting is dim, focused on the bed, with dark curtains and a pendant lamp in the background.