Ask Elizabeth to sit on Amy's face.

"Harder, dammit!" Amy insisted. Meanwhile, Elizabeth had her hands working desperately on herself. I leaned over and whispered in her ear. With a glazed look in her eyes, she nodded.

"Do you think?"

"Just try it."

Elizabeth crawled over to Amy and I continued to slam into her snatch. With a final look in my direction, Elizabeth swung a leg over Amy. From my perspective, I could only see my girlfriend's perfectly round ass and a small tuft of red hair. I wasn't sure what Amy would do when presented with a mouthful of pussy but soon sloppy, pleasured sounds started humming through the room. Elizabeth braced herself on the headboard.

Now that she was distracted, I took my time, enjoying the way that Amy's slit gripped my cock. Watching her pink pussy cling desperately to me every time I pulled out, that jump every time I pushed back in....

It looked like Amy was making quick work of Elizabeth. I recognized the pitch of her moans and they were bringing me closer and closer.

My whole body started to tense up. I knew that I was close, but I didn't want to stop.

"I... I'm really close."

I heard a smacking sound that nearly sent me over the edge. "Don't fucking stop!" Amy moaned into Elizabeth. "Don't you fucking stop!" More muffled hums as she dove back into my girlfriend.

"I'm gonna cum inside, okay?" Amy's pink lips pulled at me, urged me on.

I looked up. Elizabeth nodded and that was all the permission I needed. I sped up and pounded into Amy, exploding inside her so hard it hurt.

As I filled her, Amy went wild on Elizabeth. In a moment, the brunette's hips began to thrust as her orgasm sent shivers through her. When she climbed off, Amy presented quite a sight. Her red hair was a mess, matted and tangled. She was licking pussy off her wet lips, and there was a gleam of sweat on her upper chest.

"Don't pull out yet, Ian." She commanded. "I'm so close and I want to cum on your gorgeous cock. Elizabeth, would you mind returning the favor?"

Without another word, my girlfriend bent down to where my member met Amy. Her clit was on fire, begging for attention, and Elizabeth attacked it with her tongue. I did my best to keep pressure on from inside her and reached up to tug hard at Amy's perfect tits.

I leaned in for a kiss. Elizabeth's juices gave new flavor to Amy's mouth as our tongue swirled then she broke away and howled obscenities as her whole body convulsed. She was cumming for what seemed like five full minutes.

After that, we all finally got a sober look at each other. Amy split first and we heard the water running.

"Amy's an animal, huh?"

"Yeah."

"Hey--"

"This was great. I... I really enjoyed that night... you know, after prom. And Amy... she... surprised me. I guess... I really don't mind if you, you know, help Amy out this summer. Just... you know...keep me in the loop?"

I grinned. Elizabeth showered next.

"So," Amy met my eyes, "did I totally fuck up your relationship?"

"Actually, she's fine with this. But she wants to be... uh... involved."

"What, really? I guess being official isn't a **** sentence after all."

I watched as she dressed. Sports bra, panties, lounge pants, tank top. "You surprised Elizabeth. We didn't think that you'd go for it."

"What? Go for her?" She laughed. "I don't, but I've wanted to try it for a bit. Better to get it out of the way now, avoid the stereotype. 'Experimenting in college.' Bullshit. I'm advanced!"

Elizabeth returned and I took my chance in the shower. We had to head out right after that, in case Amy's folks came home.

When we got back to her place, Elizabeth invited me in. We waited until her parents went to bed and then made furious love until we fell asleep together.

The summer rushed along in a blur of rendezvous at Amy's. Sometimes it was just me and her, a quickie between her summer activities. Elizabeth would join us when she could, although she made it clear that Amy and I could get together whenever we wanted. When my girlfriend did join us, I usually focused on Amy and finished Elizabeth off later. It was pretty clear that Amy was indifferent to "watching."

Then, one day in early August, I noticed that Elizabeth seemed distracted as we were finishing a meal together. This whole time, with the Amy thing, I had kept waiting for the other shoe to fall. A dread built up in my gut but I screwed up courage and asked anyway.

"Well..." she started quietly, "we're, you know, leaving for college soon."

She let that hang there for a bit. We'd known back in May that we weren't headed to the same schools, the same coast even.

"I wonder... I'm wondering... um... do you think? Jeez. This is so dumb." She took a breath. "Do you think that I should have more experience before I leave?"

Relief gave way immediately to arousal. Was my girlfriend asking for me to set her up?

I asked, "What do you have in mind?"

"I dunno. It just... well, you've had all these experiences with us. With Amy, and Stephanie, you know... don't you think? It's only fair."