Horn for the first time

The day is passing, and the night is coming. I was there, apprehensive, had finally managed to convince my girlfriend go out with another guy. We were going to meet an Internet acquaintance who was crazy horny for my girlfriend. We are a young couple, me 20 and she 22, we have been dating for four years but still do not live together. I live in an apartment, and she lives with her parents. 7:30 pm was the appointed time that I would pick her up at home and 8:00 p.m. it was the agreed-upon time with my friend in a small bar. Almost on schedule, I finish packing myself a little nervously, I'll take my car to find her. When we get there, she opens the door and I see her beautifully dressed in a little gown that covers up to the end of her butt with high heels and red lipstick on. On our way back into the bar, I realize she's nervous too, so I ask if she doesn't want to turn around and she says absolutely no. We arrive at the bar and then we meet this guy: his name is Gustavo; he stands 1.84 m tall, has normal body, 28 years old, blue eyes and an unfinished beard, handsome. We greet each other and sit down together - me, my girlfriend and him. We're chatting, drinking beer and I don't even know my girlfriend is making out with Guto under the table he strokes her fat thighs she slides his dick over his trousers we decide to go up to my apartment we pay our bill then drive back to my car i sit in the driver seat while you two are sitting on the backseat barely get started they start kissing and petting each other see that it will be a crazy night We go to my room and when we get there she throws herself upside down on the double bed, exposing her ass all over it with a white threaded panties buried in that huge bundle of underwear I had given her as a gift. He without waiting lies on the bed and opens her legs, puts those pants aside and starts licking willingly at her butt and pussy making her scream from excitement. She begins rolling slowly into Guto's face who also goes crazy just watching me very excited. He can't stand it anymore, he gets on his knees in bed and takes off the shirt. And goes to take off his pants along with underwear, making his 18 cm thick cock jump out...all shaved, she looks at him and becomes much more excited, then she shrinks her legs so that Guto would remove his panties, he does it and she says: this is a gift for you! He takes a long sniff at his underwear and keeps it with her clothes, and without waiting any longer my girlfriend gets up on the fourth floor sticking out her ass showing off that smooth pink lipstick. I'm very horny, so I take off my pants and sit in the chair next to me and punch myself while watching this scene, she sees me doing it there and says to Guto pointing at me: did you see how small he is? Guto pulls out the stick from inside and lies next to her, without making a fuss she climbs on that cock and starts sitting willingly, giving to hear the noises of his huge ass hitting on Guto's thighs, screaming very much, making a scandal, and Guto there worshipping, filling it with slaps in the buttocks and hips, she had already mocked at least 4 times. Guto tells her to get up because he wants to eat her standing, she gets up and so does him, quickly he takes her in his arms and starts making her squirt very hard against his dick, causing her to scream really loudly of excitement, since she had never done that position. Then Guto makes her come down and kneel before him as I was going to make fun, she sucks a little bit his cock and then he laughs, making some jets go into her mouth and others hit the face. Guto, very naughty, asks me to kiss her...I answer it. The night ends with a good bath at 3 in the tub and Guto sleeps on my bed with her. And me, the meek little horn of history sleeping on a couch.
This was my first short story. I hope you liked it, commented on it and gave me some criticism or suggestions.
Oh, thank you.
Boyfriend is an exhibitionist.