My fellow travelers on the train

It was already dark outside, and the Moscow-Vladivostok train had just gotten underway. I was going on a two-week business trip and had booked the bottom berth in a four-berth compartment. When I got on, two female students were already there—clearly heading home. One was a brunette, about 20 or 21 years old, with luscious D-cup breasts that were so prominent even under her loose T-shirt that it was impossible to take your eyes off her. The other was a brunette with a slim waist, long, slender legs in short shorts, and a trim, model-like bottom. Both were incredibly cute and laughing at something on their phones. I introduced myself, and they smiled. "Katya," said the big-breasted woman, "Masha," the brunette. They immediately realized the ride was long, so they pulled a bottle of vodka, Coke, and chips from their bags. "Want some?" Katya asked with a wink. Of course I will. An hour later, we were on familiar terms. The train rocked, the night was flying past outside, and the compartment was getting hotter and hotter. We drank a second, then a third. Katya took off her T-shirt, leaving her in just her bra—her breasts spilling out, her nipples already poking through the thin fabric. Masha sat across from me, her long legs draped over my lap, laughing: "You look like you're about to eat us both." I couldn't resist, put the glass down, put my arm around Masha's waist, and pulled her close. She responded immediately—kissed me hungrily, her tongue in my mouth, her hand already reaching down my pants. Katya didn't wait. She crawled closer, unbuckled my belt, pulled out my now-hard cock, and wordlessly took it into her mouth. Deeply, wetly, greedily. Meanwhile, Masha was kissing my neck and pulling down her shorts and panties. I slipped my hand between her long legs—her pussy was already wet, smoothly shaved, and my fingers slid inside immediately. She moaned into my lips. We moved to the top bunk. I lay on my back, Katya sat on top of me, her large breasts in my face. I sucked her swollen nipples, biting them lightly, and she impaled herself on my cock. Tight, hot, wet. Masha knelt above me, facing Katya. I licked her clit while she rubbed herself against my tongue, and Katya kissed Masha on the lips and squeezed her small, firm breasts. Then they switched. Masha lay on her back, and I entered her from behind, holding her by her slender waist. I fucked her deeply and hard. Her long legs shook, and she screamed into the pillow, "More, harder!" Katya sat on her face. Masha licked her pussy, and I spanked Katya's big bottom. The only sounds in the compartment were wet slaps, moans, and the creaking of the bunk. We had a real roller coaster ride. I fucked Masha while Katya sucked my balls, then pulled out and immediately entered Katya, and Masha helped her cum with her fingers. The girls came one after the other—first Masha, clenching around my cock, then Katya, covering my face with her warm juices. I couldn't take it anymore, pulled out, and came all over both of their faces and chests—thick streams running down Katya's large breasts and Masha's neck. They both licked me clean, laughing and kissing each other. Then we had sex twice more—once in the vestibule, when we went out for a smoke (I took turns screwing them, pinning them against the wall while the train rumbled). The second time was in the early morning, when everyone in the car was asleep—I was lying in the middle on the bottom bunk, Katya was riding me, and Masha was sitting on my face. We all came together, in complete silence. In the morning they both woke up in my arms, naked and happy. P.S. Based on real events.