Here is how I once came into my friend's panties and she put them on immediately afterwards: we were at a camping site and there was a lake so we decided to have a swim. There was a changing room with a shower but first it was quite busy and only one two showers, with two separate changing booths (unisex) so we decided to change into our swimming gear in the tent, first me and then her. THen we had a swim and when we were finished we saw that the changing room was empty so we decided to have a shower there before we got back to the tent, where we had our ordinary clothes. Both changing booths and both showers were available so we had a shower at the same time, even though there was no doors, just a shower curtain and outside some benches and hooks for the clothes. I was quite turned on from having seen her in her bikini and when I had my shower I started to masturbate. And then I thought she must have her bikini lying in her booth, just outside her shower curtain. Carefully I got out of my shower and checked around the corner and there they were laying on the bench. I carefully picked up her bikini panties and sniffed them and although they were soaking wet I could smell the sweet scent from her pussy. This was very exciting! I stood there stroking my rock hard cock while sniffing the panties and then I came real hard , shooting my whole load into the crotch of them, and then put them back carefully so the cum wasn't visible at first sight. Then I got back to my shower and cleaned. A moment later, as I was putting my swimming pants back on, I heard her shower stop and the shower curtain move and then shuffling sounds as she put her bikini back on. She didn't say anything so I figured she didn't feel the cum because her entire bikini was soaking wet. "Are you there??" she asked me, "Yeah I'm finished" I said, and as we both got out of the shower cabin I couldn't resist looking at her crotch and imagining all my cum still in there, covering her pussy. We joked about how uncomfortable the wet clothes felt and I noticed how she kept adjusting the crotch of her panties with her hand, like pulling a bit and then pressing. This was such a turn on.