What about your towel?

Alyssa: "I guess that would work..." You help Alyssa wipe Sid's cum off her body and her pussy. Then you place your head in her crotch and place your mouth where Sid's cock was just moments ago. You start licking and sucking Alyssa's pussy, trying your best to make you cum. You can still taste Sid's foul cum on Alyssa's pussy.

Sid stays silent, even though he's supposed to be helping you learn how to make your girlfriend cum.

After a long while, Alyssa stops you. "It's starting to hurt, babe. It's not happening...."

Sid: "Shame....if Matt hadn't stopped me, you would have come multiple times tonight. Well, I'm gonna go to sleep."

Alyssa sighs....

Sid and Alyssa cozy up in the bed, leaving no space for you. You just grab a blanket and sleep on the floor...again....

When you wake up, it's morning, and unlike before, Sid and Alyssa are fast asleep, both nude. Sid is spooning Alyssa, his hand on her big breast.

You leave for the bathroom and come back about 30 minutes later, because you had to wait for someone else in the bathroom.

When you enter the bedroom again, Sid and Alyssa are obviously awake. They've thrown the covers off, lying on their sides, you're faced with Sid's hairy ass. He's pounding his hips into your girlfriend's ass, making little flesh slapping noises. Alyssa is giving out whispered moans, as if she doesn't want anyone to know what they're doing.

You: "What the fuck are you doing???" You whisper shout, not wanting the roommates to know anything.

You run over to Alyssa's side, her cheeks are flushed, she's biting her lower lip, she's massaging one of her breasts with one hand. With the other, she's stroking Sid's massive cock head, poking out from in the middle of her crotch, buried in the folds of her pussy.

Sid: "Just grinding, bud. That's not against your rules, right? I woke Alyssa up with the side-position. You're not gonna stop this, too? Alyssa needs to cum, too, can't be too selfish..."

Alyssa: "Don't be selfish babe, I'm so horny from last night. Please let Sid make me cum....!"

You: "Alright, fine...."

Sid speeds up his pounding, and Alyssa resumes her stroking. After a long while, you get tired of this. You can't even get your dick hard, because it's been too soon since you last came.

You: "How long is this gonna take? I gotta go to school"

Sid: "We'd cum a lot faster if you'd let us fuck..."

You: "Nevermind..."

After a few more minutes, you say your goodbyes to Alyssa and leave while they're still grinding their genitals together, both sweaty as hell and breathing heavily. After 30 minutes, you get a picture of Alyssa covered in Sid's cum again. "I finally came! Thanks, baby! -Alyssa"

The next few days, Sid sends you, with Alyssa's phone, pictures of his cum all over your girlfriend's pussy, or in her mouth, or on her breasts. One day, when Alyssa is sleeping over at yours, your cuddling in bed.

Alyssa: "Babe....I've been thinking...Sid and I have been grinding, like you said. And it's been great, and all...but.."

You: "but?...what are you getting at?"

Alyssa: "...well...Sid says you and I won't get to the next level if we keep going like this..."

You: "Like what...?"

Alyssa: "without....sex..."

You: "Well, I'm more than willing, Alyssa. Let's go!"

Alyssa: "I just haven't gotten to the same level of comfortability with you, that I've gotten to with Sid....It's just different....I really feel like I should get the nervousness out with Sid first, then move on to you....what do you think?"

You: "Sid just wants to take your virginity, Alyssa..."

Alyssa: "It's not such a big deal, babe...."

You: "You're just saying that because Sid planted the idea in your head..."

Alyssa: "I'm really not, Matt! I swear to God! It would be one time with Sid, then you and I would be able to go on like a regular couple. I just have to get it out of my system, you know?"