The Intrusion (1975) (Better Quality)

Skinny blonde with a neck tattoo starts off alone, bending over in a bathroom wrapped in a towel — you can see her back and ass through the fabric. Next thing you know, two guys show up and take over. They fuck her in the bedroom, one of them slamming her in doggy while the other jerks off watching. She takes a cumshot in the mouth from the second guy after sucking him down hard. Camera stays static, mostly wide and medium shots, but gets tight on her face during the creampie. Looks like a rough, low-budget amateur setup but the sex feels raw and unfiltered.