In the outdoor shower, cleaning up after the naked body painting. We 3 girls got a bit horny and started making out in the shower. After we were all cleaned up, I went down on one of the girls, while she was kissing the other. A creepy guy had come into the shower behind me (I didn't notice him) and started jerking off! The next thing I feel is something warm and wet being sprayed all over my back! The guy squirted CUM all over me! It was disgusting! The guy ran off, and I never saw him again.