One summer, my bf (m32) surprised me (F26) with a day trip to a luxury hot springs spa near his desert hometown and told me to pack a skimpy bikini for it. While there, I noticed 1) I was definitely the most scantily clad 2) other people noticed this too. He then told me that he reserved a private "room" for us that had its own hot spring pool in it. I put “room” in quotes because there was no ceiling, just four walls and the open sky so anyone next to us could hear us.When we got into the room, it took less than 15 minutes? Okay, 10 minutes for us to forgo soaking, and we got straight to fucking on the chaise. Throughout all the positions we went through – missionary, cowgirl, doggy (y’know, the standard ones), I tried my best to keep quiet, but my bf was not having it and urged me to be louder so I exhaled breathy whimpers and guttural moans when the sensations washed over me. The sound that filled the otherwise quiet air was the slaps of my ass against his thighs or abdomen as it slammed back into him or his cock plunged into me over and over. When I got close, so did he, and he fucked me even harder and pushed me over the edge. I fell forward, but not before he emptied every drop of his balls deep into me.When we cleaned up and left, I walked down the stairs and caught the eyes of another couple heading down at the same time across from me. The man in the couple winked and my bf whispered to me that we should do that more often. Maybe we will….