Fella (1977)

The blonde has long hair, a black bra, and a visible tattoo on her side. She’s slim with small tits and takes it hard from behind in doggy style, moaning with her face against the wall. The guy is dark-haired, muscular, wearing a white shirt rolled up, slamming into her from behind with deep, rough strokes. At one point he pulls out and jerks off with a tight grip, shooting a thick load in close-up. Earlier scenes show them talking in a living room, then kissing closely before things heat up. The lighting shifts from normal to high contrast, especially during the close-up cumshot and her facial expressions near climax.