It's really best to read this series of stories in order for continuity.
End of Part 2:
"Gimme," she demanded as she curled her fingers over the waist of my trunks and began to pull. I had to reach inside and untie the waist drawstring to allow their removal. I lifted my butt to let her complete her task.
I spread my legs and slid close to the edge to allow her a better view. She licked, then kissed the head and said, "Please tell me if I can do anything better for you."
"It's a deal," I said, watching as my cockhead disappeared between her lips and dreaming about blowjobs to come.
Part 3:
I was thinking this has got to be the best thing in the world, but I remembered that everything I did with Lisa was the best thing in the world and that it's easy to feel like you're in love with a beautiful girl who is currently giving you head.
She was trying different things to see which I responded best to. She tried slow, fast, shallow, deep. She tried licking my balls and sucking them into her mouth. She tried lightly biting. Except for the last, I liked them all and tried to relate my approval through my grunts and moans. I was very hard, but I was just cruising along enjoying this feeling. I felt like I could last for a while at this rate.
It was about then that I heard Carla say, "Mind if we join you?" as she walked outside, Bert behind her. I had my back toward the door, so it wasn't immediately obvious what, exactly, we were doing.
Lisa let my cock slip from her mouth but didn't let go with her hands. I was too surprised to react quickly so as Carla came close, she saw exactly what we'd been doing. If we had been intent on not being interrupted, we could have gone inside the changing room or waited until we were alone. Carla was still topless and said, "Don't let us stop you," as she stepped into the water.
Lisa, also topless, asked me, "Are you okay?"
"Yeah, I guess" with a smile on my face.
Lisa turned to look at Carla, "You did this on purpose."
"Did not."
"Did too."
"Did not... Okay, of course we did it on purpose."
Lisa seemed to have forgotten that her beautiful pink nipples were on full display. "Are you sure you're okay with this," she asked still holding my cock.
"Why the hell not."
Lisa quickly looked at Bert, then turned back and lowered her lips back to business.
"Now that's hot," Carla observed. "Bert, I'm gonna need me some of that," she said as she hopped up onto the edge of the tub, rolled onto her back and stripped off her bottoms. I got a great, if momentary, view of her ass. Carla was looking at me when she sat up to see if I had looked at her pussy and ass during the maneuver.
I was facing Carla, but Lisa had to turn around to see what was going on. "Carla, I can't believe..." she said as Bert moved around to get in position.
Lisa turned around, looked up into my eyes, and began again.
Watching Bert eat Carla was the stuff of legends for an 18-year-old guy. At first, she was quiet, but started moaning louder and louder, watching Lisa's head bob up and down. Carla and I were both leaning back on our hands, and we made prolonged eye contact several times. It was obvious that she enjoyed the shared intimacy. I could hear the wet squishy noises coming from her pussy and I could feel my orgasm approaching like a train still a mile away.
I could have slowed Lisa down, or pulled away to calm myself, but this was just too good. I began moaning in time with my exaggerated breathing and so did Carla. Our breathing got faster and faster as we got closer. Carla looked directly into my eyes and smiled before her eyes rolled back into her head, "Aaaaahhh". I came a second later. It took me so long to recover that I didn't see what Lisa did with my spunk, but it was gone.
I slid down into the tub and wrapped my arms around my lover, but Carla stayed on the edge with her legs spread lasciviously, gently rubbing her pussy for about 30 seconds before dropping into the water.
After 5 minutes or so, I said, "I should be getting home. Can I walk you home?" I put my clothes back on not bothering to use the changing room. Lisa didn't bother to put her suit top back on. She just pulled on her t-shirt and running shorts. We thanked our friends and headed out the back gate.
I was kissing Lisa goodbye when Mrs. Archer opened the front door. She had her purse and keys. "Oh hi, kids," she said, "I have to run out for a minute. Good pool party?"
"It was great Mrs. Archer. That's a nice setup they've got in the back yard."
"It is, isn't it. I've spent a lot of time there with the kids over the years. Uh, can I give you a lift home? You live over in the Nyborg area, right? That's on my way."
I looked at Lisa. She pursed her lips in a little smile, lifted her eyebrows, and tipped her head as in saying, 'why not?'.
"I'll be in the car," she said with a smile.
I kissed Lisa again. She was surprised at how big a kiss it was considering her mom was right there, but I whispered, "Don't worry, I've got this."