I was caught naked

This is another episode in the posts about my experiences when visiting local lakes with my friends:

Several years ago during summer, a few of my friends and I decided to cycle to a nearby lake on the weekend. We arranged to meet at my place around noon. Some of them arrived unexpectedly early, though. One of my flat mates answered the door and told them to head for my room. I had not heard them coming and was right in the process of undressing and putting on my bikini. When the door suddenly openend, I was not only nude, to make matters worse, I was leaning down to pick up my bikini bottoms and my back was facing them. So my friends got a perfect view of my butt and my lips between them. I was so shocked that I froze into place for the moment. I looked back at them, still leaning down, and they looked at me staring right at my butt and lips.

[From here on my memory got a bit fuzzy.]

One of them actually started to smirk (he who saw me without panties in a previous post) and stepped forward. He reached out and traced my lips with his index finger. I was so shocked that I couldn't say anything or move. He continued to slide his fingers over my lips and circled my clit as he began to caress my butt with the other hand. I couldn't help myself and let out a small moan, involuntarily indicating my arousel. I was still frozen and shocked at his insolence. Looking up, I could see a growing buldge in his pants and a confident smile on his face. Looking over to the door frame, my two other friends were just standing there with gaping mouths and did not make any attempt to move. I had to let out another small moan, realizing that my clit was stimulated just the way I loved it. My eyes were already half-closed as I enjoyed the feeling. Then I shook my head to clear my mind and thought 'no, I have to stop him'. Just in that moment, he sank in two fingers between my lips causing me to to moan again in surprise, louder this time. This was so good. I was thrown back in my blissful aroused state. My eyes began to close again and my mouth started to drop open. He had me now.

Feeling my tension ebbing off and my body relaxing, he too realized that he had won me over. He continued to stimulate my clit with his thumb as he inserted and retracted two fingers into me. One could already here that I was getting wetter by the smacking sounds his fingers made. With the other hand he fumbled with his knob and zipper...

[My memory got really clouded, it would be great if anyone could fill in my blanks with a continuation...]



And as always, some images. Much later that day I was wearing these bikini bottoms and top.
https://www.imagebam.com/view/GA734Y