The Tunnel (1980)

Starts with this brunette MILF in a scarf bending over the desk, sucking the bald guy’s cock while the skinny blonde with long straight hair kneels beside them, jerking him off and kissing his neck. They switch fast—blonde hops on his lap, riding reverse cowgirl so you get a clear shot of her tight ass bouncing. Camera lingers on her small tits swaying while the MILF leans in, making out with both of them. Later they flip her onto the desk, doggy style, and the MILF spreads her cheeks wide so you see everything. Lighting’s warm from the desk lamp, no shaky cam, just steady close-ups of the action. Good mix of oral and full-on fucking without too much fluff.