Monica's phone's running out battery!

"Julie? This thing is at 1% already" Marie says. "Woah, it's gotten hot from all the call."

She's currently fucking Monica sideways, according to my girlfriend's exhasuted voice. She sounds as if she's about to pass out of pleasure, but still does and moves as Marie commands.

"Aw, fuck" I've cum so much I've run out of semen, and my orgasms are a little painful even. Most of my loads have dried on my belly, tits, and thighs. "It's OK, I've loved it so much so far."

"I'll give you your girlfriend back in the morning!" Marie says without skipping a beat, still fucking her hard. "Mon! Say bye to Julie! You'll see her later!"

"B-bye! Love you!!" Monica manages to say, I can hear a smile on her. She's so adorable, even on the brink of exhaustion, even under layers of sticky semen, even having been fucked for hours, she's a cute angel. The phone turns off just as she makes a smooching sound.

I lie on my girlfriend's bed. I wanna keep on masturbating, but I'm so tired. I don't know how Monica has lasted this much. Is she that much of a slut deep within? The sound of Marie fucking her hard is burned into my mind, and I adore it. I wanna hear her again. I want that big, strong futa to fuck my girlfriend over and over. I wanna see her long orgasms, getting cum in and on once again, and again, and again.

Am I making a mistake with our relationship?

I check the time, and it's already three and a half in the morning. I try to get some sleep, but Monica's moans reverberate in my head, so I can't for a while