Last weekend I was at the beach with a female friend of mine, and we were sunbathing and had the beach to ourselves (its a small relatively unknown beach). She wore just a bikini and the sight of her sexy body turned me on, so I got aroused and felt my cock becoming harder. I wore baggy shorts so I managed to hide my hardon while I sat next to her, pretending to read. Then she turned over and lay on her stomach and as I saw her sexy ass and her boobs pressed against the ground I couldn't resist masturbating. Fortunately she was reading a book and her head was turned away from me so I was safe to carefully stroke my cock, and noone else was nearby. After a while she asked me: "Can you put on some sun screen lotion on my back?? im frying in the sun." "sure" i replied, "just a sec while i finish this page". But i wasn't reading..instead i finished wanking, and just as I was about to come I got up and grabbed the bottle and said "okay are you ready??" "sure" she said, and I came hard all over her back. My cum was shooting in several streaks, from her lower back and up to her neck. After a few seconds she said "WHOA! slow down. go easy with the lotion. It's not cheap, you know." and I just said "oh sorry" and then I started smearing out my cum over her. I kept massaging my cum into her skin and she just said "that feels great".