Brother Interrupted - Part 3

It had been a couple weeks since I jerked off in front of my sister, and to be completely honest, the teasing and prodding towards me had dropped off to almost nothing. In fact, it almost felt like she was looking at me differently; almost in a lustful way. A few times late at night she would walk by my room and slow down, peeking in without actually looking, kind of like she was wanting to catch me in the act again. A couple times while watching TV I caught her glancing down at my crotch, seeing if she was going to find at least a semi-erection. Nevertheless, she walked away empty-handed each time. Oh sure, I was masturbating every day, but it was usually in the shower or quickly first thing in the morning with no opportunity for her to see me doing the deed. 

What did happen, however, happened in the middle of July. We were in the middle of a heat wave and it was scorching hot outside. My sister had met up with the same friend early in the morning to walk down to the mall to escape some of the daytime boredom. They had only been gone for about 40 minutes when they walked back into the house. Even at 10:30 the heat was too much to walk the couple miles outside. With this, her friend was looking...wow. Spaghetti strap shirt, tight jean shorts that barely made it halfway down her thighs and silver flip flops. I don't even think she had on a bra. I, on the other hand, was eating my cereal in the living room wearing nothing but a pair of gym shorts. They headed off to her room, and not wanting to run the chance of her being up my ass all day, went back to my room as well. I would guess an hour went by (I was watching some bullshit daytime talk show, seemed like an hour), and then there was a knock on my door. I said it was open and the two of them walked in. I sat up and asked what they wanted, but really wasn't prepared for where the conversation was going to go.

"Hey, uh...we had a question." 

"Ok, what?"

"You know how you...in front of me the other day?"

I had to try to play it like I wasn't bothered. 

"Yeah, what about it?"

"We were talking about it, and...could you do it again?"

Gulp.

"Wait. You talked about it?" (I didn't think she actually would) 

They both just nodded. 

Her friend then said "I've never seen a penis before and we thought maybe you could show yours and make it cum again."

Just this girl standing in front of me saying the word 'penis' was enough to make me want to jerk off right then and there. 

"I don't know. What's in it for me?"

"What do you want?" my sister asked. 

I thought about it for a second and then said "you have to get naked while I do it. Both of you." 

My sister then said "you want me naked? Why?"

"That way if you blab about it to anyone else I'll tell them you stripped naked with me. It'll make you look even worse."

She looked at her friend and said they would have to think about it and went back to her room. My heart felt like it was going to burst out of my chest. Not only is there a chance I'll see her friend naked but I was in command of all of it. 

I laid there with my hands behind my head and ankles crossed for about 15 minutes before they came back. "We'll do it" my sister said. 

"Ok, I'll meet you in the basement." 

They left and headed downstairs and I followed a couple minutes later with my hands shaking. I grabbed some dirty bath towels for us to sit on and her friend asked what we should do now. Pretty bluntly, I just said "strip". They both slowly started pulling off their clothes and holy shit her friend was a sight to see. Pale, milky skin with decent sized breasts, small nipples and a patch of dark pubic hair just above her slit. My sister then said with her hands on her naked hips "ok, it's your turn." I didn't have much to pull off, so I pulled my waistband over my rock hard cock and let my shorts fall to my feet, stepping out of them. Her friend's eyes grew wide seeing my erection bobbing up and down. The three of us just stood there for about 15 seconds just staring at our naked selves. Her friend said "so.. what do we do now?" "I guess I'll masturbate." I sat on my towel and then got on their knees on theirs and watched as I started to stroke. Having two naked girls in front of me, I knew I wasn't going to last long, but I made a conscious effort to hold back as long as I could. Her friend then sheepishly asked me "you like feet, don't you?" I couldn't believe my sister told her about my foot fetish. "Yeah, I guess so. Why?" She then reached back and picked up her flip flops, holding them out to me. "What do you want me to do with your sandals?" She shrugged and said "I dunno...cum on them?" "You...you want me to cum on your sandals?" She nodded yes. I got up on my knees and held one of them up to my face, smelling and licking the footprint in the sole. She just sat back on her heels, watching every move...every stroke. It wasn't too much longer before I knew I was about to shoot my load, so I took both sandals and set them in front of me. Leaning forward, I was breathing hard and stroking fast, moaning that I was about to cum. Then, in dead silence, I came. Half a dozen thick shots of cum shot across the silver soles of her sandals, and she watched every one with her eyes bugged out and jaw dropped. I milked out what I could before falling backwards onto my elbows, my cock still standing up with some remaining cum leaking from the tip and rolling down my shaft. 

"So...what did you think?" She sat there for a few seconds. "That was...amazing." Without any pushing she then reached between her legs, closed her eyes and started rubbing herself. My sister and I couldn't believe it, but she was masturbating right there in front of us. One hand was squeezing her breasts and the other was fingering her slit, her head now forward and hair covering her face. We both watched closely as she brought herself closer and closer to orgasm, until finally she loudly grunted and moaned, held herself and shook as her orgasm rolled through her body. After coming down she brushed her hair back with a relieved look on her face. She then looked over at my sister, who was sitting with her knees pulled up to her chest and said "well?" "Well what?" "It's your turn." "No way, I'm not masturbating in front of you guys." "Oh come on, you know you want to. Not fair that we got off and you didn't." I then said "you watched me cum twice. It's not like you don't do it." Her friend then moved her arms away and spread her knees apart for her, showing us her wet vagina. My sister then took an annoyed breath and started rubbing herself, sitting back on one elbow with her feet flat on the towel. Her friend laid down on her belly with her feet in the air, watching the show next to her. Eyes closed and mouth open her hand moved back and forth against her swollen lips, every so often letting out a soft moan. I'm not sure how long she was at it, but soon she was flat on her back, feet apart and toes wiggling, digging inside herself. Breathing hard she whispered over and over she was about to cum before her back arched and she squealed, cumming hard with a few drops of pussy juice dripping onto the towel. 

By this point I was already stroking myself again, and when her friend noticed it she scooted closer to me, holding up her foot and pressing it against my face. I grabbed her ankle and rubbed my face hard into her foot, licking the sweat from her sole and between her toes. She groaned "oooh...keep doing that" as she started rubbing herself again. With her toes in my mouth I mumbled "shit, I'm gonna cum." "Already?" "Mmhmm." A few more seconds of stroking was all I needed before blowing a second load all over myself. Seeing it she said don't stop sucking, keep sucking my toes." Even with cum on my hand I grabbed her foot and rolled my tongue all over her toes until I felt them spread apart as she came for a second time. She pulled her wet foot away and curled in a ball as she shivered, reeling from her second cum. It felt like forever that we all just laid there in silence before her friend said "that was the best cum I've ever felt. I never knew being watched would feel so good." I agreed, then asked if she liked watching a boy masturbate in front of her. She giggled and nodded yes. My sister then said we needed to get cleaned up before our parents got home out they would kill us. I wiped up my cum and the friend went to the sink and washed off her sandals before slipping them back on. Just seeing her naked and wearing them made me want to start jerking again, but I held off. We buried the towels in the hamper and got rid of any evidence before getting dressed, and they then decided to go back to the friend's house, but not before the friend said she wanted to do this again, and told my sister that next time she was cumming more than once. "Yeah yeah, we'll see."

I made my way to the couch and laid there until mom got home, and when she asked about my day I told her I pretty much just laid around. She then asked if my sister had bothered me at all today, and I told her no, I don't think she's going to any more. She smiled and said that's good, having no clue of the wild afternoon we all had.