Let's go home.

You pay for the stuff, and get a taxi home. You have to get two taxis, on account of all the stuff. Before you can get into the taxi with Alyssa, Sid has already gotten in. So you take the other taxi, thinking about what they're doing and saying in there the whole ride.

When you arrive, Alyssa drags Sid up to the apartment, without taking any boxes up. "Come on, I can't wait to show you around our new home!"

Sid: "Alright, you don't mind hauling the stuff up yourself, bud?"

You: "uhm, actually...." But they already left upstairs. You pay the drivers and start bringing one of the many boxes up the three flights of stairs up to your apartment. When you get up there, Alyssa is showing Sid the kitchen. On your second trip, the bathroom. "Matt's got an amazing, roomy shower. It's great!" She says with enthusiasm. "We're gonna have some good times in here, for sure." Says Sid, causing you to purse your lips.

On the third trip, Alyssa and Sid have disappeared from sight. Probably she's showing him the two bedrooms...

On the fourth trip, you can hear slight moaning coming from the bedroom...

You: "Alyssa? You okay, babe? Are you done with the tour? I could use some help with the boxes..."

Alyssa: "uuugh, yeah thanks honey, be right thereee!"

On the fifth trip, Sid and Alyssa are still nowhere to be found. No discernable sound to be heard. They're probably deciding how to reorganize to fit all the new stuff in....

On the sixth and final trip, you set down the last box, and try and find Sid and Alyssa. You enter the guestroom, soon to be Sid's room, and they're not there. You enter the master bedroom, and the familiar smell of sex immediately hits your nostrils.

Alyssa is on top of Sid, both fully nude. In the time it took you to bring the boxes up, they've worked up quite the sweat. Alyssa is on her knees, upright, her large sweaty, perky breasts on full display, her nipples hard as rocks. You look down, where her butt meets Sid's crotch, hoping to see that they're just grinding.

Alyssa is gliding back and forth, focused completely on Sid, and doesn't notice you at all. She moves up from his crotch, probably to reposition, but then you can see it. Her pussy walls are stretched to the maximum. Sid's naked, erect cock is buried balls deep in your girlfriend's unprotected pussy... again.

Sid: "Hey bud, we got bored so we thought we might practice the cowgirl position again." He says it so nonchalantly, like he isn't even fucking your girlfriend.

Alyssa: "Sorry, babyyyy. I just thought this was a good time for our first lesson in the new apartment....ughhhnn....so big..."

You shouldn't be surprised, but you are. They completely disregarded you, using the opportunity while you were busy with the boxes to sneak away and fuck. Without your permission or knowledge. They clearly had no other intention, their clothes are scattered to the wind on the floor...

Feeling your stomach twist, you...