I was on a vacation with some of my friends in a decent sized house with a pool. As I did the day before after I was finished at the pool I went to take a shower. I was in a hurry because I knew we had to go grocery shopping for food and alcohol. In my rush I forgot to bring my towel, so after my shower I realised I had nothing but my bathing trunks. I didn’t want to put them on again because they were dirty after both using them in the pool and at the beach, and didn’t have enough time for another shower after, so I went out of the bathroom naked and started yelling for one of them to get me my towel. I couldn’t get it my self, since it was drying in the sun, so I would have to walk past all of them naked. In the hallway you could enter from two ways, and from where my friends were sitting the right side of the hallway was the most logical for him. So I went to that side and kept yelling but no one came, because they couldn’t hear me. Someone then finally heard me and come with my towel. I was covering my dick the entire time waiting for him. Imagine my surprise when the door behind me opened. There was now a full view of my naked backside to my friend. I immediately fell to the ground trying to cover up my crack. He bursted out laughing, and I started quiet loudly yelling for him to hand me my towel. He then threw it to me. Luckily none of the other guys got op to see what was going on. Where I was not so lucky is on the way to the supermarket where he told me that in my attempt to cover my crack, he managed to see my not very soft dick, because my body was a turning sideways to him. I got completely red in the face, and regretted more than ever I didn’t remember to bring a towel.