(F27) I (F18 at the time) had a threesome in a hotel with someone, and I still don’t know who.

First time posting here. I hope you’ll enjoy my story!

F27, but F18 at the time. My boyfriend (who was much older than me) took me to a hotel. I thought I knew what we were going to do, and I anticipated very little sleep.
I came into a nice suite; there was a bedroom, a bathroom, and a small living room. He told me to get undressed, and I did exactly that, taking my time, and enjoying his gaze on my body. Then he told me to wear my slutty outfit. I put on the black thigh highs, the very short Scottish skirt, and a tiny tight top. He sat on the sofa, and undid his trousers, and I felt myself get even wetter at the sight that he had an erection. I got on my hands and knees, and slowly crawled over to him. I took him into my mouth, and he told me to be slow and gentle, he wanted to take his time, and didn’t want to cum right away. Your wish is my command, and I love having your manhood in my mouth. I made slow movements, my lips tightly on his cock, my tongue swirling around the tip. Slow and gentle.
He guided me with his hands, strong, but gentle. I’m an obedient girl, so I know that when I suck him, my boobs have to be out, so I lifted the top. My pussy has also to be visible, but with this skirt, that wasn’t a problem. He always told me that when I was on all fours, to imagine people behind me, and that I had to please them too (he sometimes told me to suck him off in front of a full length mirror so he could see both sides). So with my back arched and my add up and high, my legs spread, I could feel my wet pussy, and the occasional drop running down my thighs.
At one point, I heard the door behind me open, and I jumped. Or at least, I tried. He held me there with those hands, commanding, but also reassuring. I was frightened, I really though that there was someone there, inside the room. When I heard the footsteps, I knew, there was someone else. I heard the unmistakeable sound of someone undoing his belt, his trousers, and letting them slip to the ground. A light thud meant that he was on his knees. Then rough hands grabbed my waist, and I felt a cock poking me. All of this while sucking off my boyfriend. I tried to be a good girl, but I was also a little frightened.
Then the mysterious man took me. My pussy was already soaked, and he slid inside me. He wasn’t gentle, he wasn’t there to please me, he was using me for his own pleasure. I was a toy, my body was being shared, offered to someone unknown. The mystery man grabbed me hard, and rammed his cock inside me, again and again. Fear turned into excitement, and wave of wave of pleasure flowed through my body. It felt so good to be used, in the safety of my boyfriend’s lap. I started moaning hard, and I soon had new orders given by those strong hands; go slow! I don’t want to cum right away. When mystery man slid a finger into my butt, I came. Loudly.
A few minutes later, mystery man started moaning, his movements became quicker, deeper… I tensed all the muscles in my pussy to try and grip him as much as I could. He came, and he exploded. I felt the movements get slower, and slower. He pulled out, gave one final slap on my ass, and got up. I heard the clothes go back on, the belt, and the click of the door as he left. All this time, I’d had my boyfriends dick in my mouth, and eyes closed. I didn’t know who it was, and to this day, I still don’t know.
One mystery man left, I thanked my boyfriend all night, wherever he wanted, however he wanted. I was his, heart and body. And he could share me if he wanted.

Source: reddit.com/r/Erotica/comments/12xb9zr/f27_i_f18_at_the_time_had_a_threesome_in_a_hotel