(Part 1 on r/sexstories)

I spent another restless night, laying in bed, hard and too nervous to touch myself. When I did sleep, it was a disjointed series of images of my wife and my sister-in-law in various states of undress, encouraging me to cum.

Breakfast was uneventful except that I felt C.'s eyes on me and maybe it was just my own paranoia that I imagined she knew what I had been dreaming about the night before.

As the whole crew was about to leave for a trip to the peach orchard we visited every year, C. announced that she was having a computer issue and needed to submit something for work. Everyone looked at me because I worked for a company that ran that exact software. I sighed.

"Why don't you all go ahead and we'll take another car and catch up in 20 minutes," she said.

After everyone left, I sighed again. "Do you really have a problem?"

"Of course not. I thought you looked like you could use a quick break." She smiled deviously.

"Um, I am not going to lie and say no to that, but we have to be more circumspect."

"Why? Do you think L. thinks we're fooling around?"

"What?! Oh, no. She would never suspect that. She knows she keeps me pretty satisfied there."

"That's why you were jerking off to my pictures two days ago?"

"Uh, well, no. It's just that she's not that frisky with so many people sharing rooms here."

"Well, this will be good for you then. You get to take care of your base urges more efficiently. So go upstairs, find yourself a room and use your photos, same as before. Close the app when you cum. Today you have only four minutes."

I didn't waste any time. I knew I would struggle to cum that quickly, so I practically ran to our bedroom. I had already picked out a picture of L. and I quickly scrolled to it: this was years ago and I had gotten this great shot of her diving for a volleyball. She was in a two-piece, her toned, brown, slightly glistening legs were flying out behind her, her cleavage below her as her arms stretched out. I ran my eyes over her body, imagining away the swimsuit. Imagining her diving down to impale my cock in her mouth. I could feel the tingling starting at the base of my cock and through my groin and knew the point of no return was seconds away when I heard a voice from the hallway yell: Stop!

"What?" I said, breathing hard.

"That's four minutes. Hands off."

I did some deep breathing and clicked my phone off. I lay in bed, on my back, erection pointing up and over my stomach, throbbing and leaking precum.

"Go on and get put back together. We have to get to the orchard." I hear from the doorway. I open my eyes and realize I forgot to shut the door and my sister-in-law was standing in the frame.

"How long have you . . .?"

"Long enough," she said through a grin. "Let's go."

I managed to tuck myself back into my shorts and we joined the rest of the family for the morning activity.

By that evening, after another afternoon of watching my wife and her sister jump around in the pool, I was fit to burst. Not that they were doing anything too purposefully to arouse me, I just may have made a mistake keying into her swimsuit for that morning's attempt.

They approached me sitting, ostensibly reading a book, which I was able to set over my growing erection as they came over, dripping water in the sun.

"Would you be up for a favor?" asked L.

"Uh, sure," I say, trepidatious because of C. next to her with a Cheshire Cat grin on her face.

"Would you be willing to pop in and make a few margaritas? Since you're dry?"

"Of course."

Then C. added: "Don't take more than four minutes," and winked at me.

L. gave her sister a sideways glance, and then rolled her eyes so I could see.

"Take as long as you need," she said, turning back to the pool.

C. mouthed at me: "Try again," and held up four fingers.

I didn't need to be told twice. I walked back up to the house and hustled to the isolated bathroom. I wasn't sure when the four minute timer started, so I was rubbing myself through my pants as I walked, thinking back to the eyefuls that I was treated to that afternoon. By the time I reached the bathroom, I had my photos up on my phone, the same picture of my wife diving for the volleyball and I was frantically stroking my cock as the door clicked shut.

I knew I was going to make it in time when the tingle started, this time in my toes and rising, but faster than I expected. My cum shot out and hit the mirror before I had a chance to get the hand towel in front of it, but at that point I didn't care. After a few more ropes spurted out of me, I looked down at my phone to close photos and saw the "accountability app" icon in the status bar. I wondered if she could see through my camera. Part of me hoped she could not, but another part was excited with the thought of her watching me.

I cleaned up, washed my hands, and headed downstairs to make a pitcher of margaritas for folks. I looked out the window and saw C. sitting on a deck chair, staring at her phone. She seemed to sense me and looked back over her shoulder, seeing me in the window and gave me a thumbs up.

I brought the drinks down and set them on the table before pouring one for C., L., and myself, then announcing that there was more for others to help themselves. L. climbed out the pool, which was maybe my favorite sight of the day: her arms pushing her up out of the water, which was running down her, making every curve glisten. She walked over and collected her drink from me with a peck.

"Can you bring mine over, please?" said a voice.

L. rolled her eyes again and giggled.

I carried C. and my drinks over and sat down in the next chair.

"Thank you. And very good job. You were under four minutes."

"I figured," I muttered.

"We'll take tomorrow off, but I'll have something for you by Monday."

"Um, I have work on Monday. My office isn't that private."

"That's not my problem. You'll have to jump when I say so or you'll lose your chance."

"But--"

"Or I can always have a chat with L. about your extracurricular . . . ahem."

"No, no. I'll give it the old college try."

"Attaboy."

"What if L. wants to fool around?"

"Then you make sure you take care of her without your cock, because once you're inside her, you had better cum in less than your allowed time."

"Seems like a punishment for L. if I'm too quick."

"Maybe," was all C. would say.