Brother And Sister Bet, The Winner Fucks The Loser.

I was spending 1-week house-sitting at my sister's place, as she and her husband were away that week. Here I was, having a good time minding the house, minus exploring the house and going through my sister's clothes draws, lol. Anyway, my sister and brother-in-law were initially meant to be away from Sunday to Saturday. I was about to make dinner on Friday night when I heard my sister coming into the house early. My sister Erin (false name) said, "I'm sorry I got home early, Eric; it was just one of our friends who needed to get home early because her kid, who her grandparents were minding, fell sick, so she had to go home early. So I decided to drive her home in my car because Toby and his mate wanted to go fishing in the morning". She told me not to feel like I had to leave and that I could stay one night if I wanted to. Since I was already making dinner, why not?

We finished dinner and then relaxed on the couch, bored with our phones. When Erin asked if I liked to play a board game, I said ok; Erin then went to find a game and returned with Jenga. We both won the first two games. When Erin said, "Tie-breaker, maybe we can up the steak", I said "yeah, ok, what you got in mind?" I thought a second and then said how about this? If you win, you get to fuck me, and if I win, I get to fuck you. I just sat there, questioning what she just said; I mean, is she for real? And what did she mean if she won? She fucks me? I mean the end of the day, I still get to fuck her, right? Erin took her jumper off as I was still deciding my answer. She was now just wearing a tank top, and damn, she looked sexy in it. So I said what the hell? Sure, why not?

The game continued when the last piece I grabbed made the Jenga tower come crashing down. At the same time, I was thinking about what it meant about the bet. "Eric, as you lost, it looks like I get to fuck you; come on, bro, let's head to my bedroom". Said Erin. I took a deep breath, got up, and said ok. Just as I got up and turned to go to my sister's room, Erin gave me a big spank on my ass.

As I walked into Erin's room with her following me; she said " I just got to go back out for a second. Feel free to take all your clothes off"; I said ok. In contrast, I felt my heartbeat beating and my cock stirring. I started taking my clothes off but left my undies on, still trying to process what was going on; I mean, was this legit? Was I actually going to fuck my sister for real, or what? Here I was, standing in my sister's bedroom in my underwear, facing her bed, when I felt something press up against my ass cheeks and then felt the hands wrap around my arm, followed by the breathing sound of someone pressing their head on my shoulder, followed by a whisper. "Are you ready to get fucked my dearest brother?" My heart started pumping more, thinking to myself, she does not have what I believe she has, when I felt the object slide under my thighs, rubbing up against my balls; I looked down, and there it was, the head of a pink coloured plastic penis. "You like what you see, brother; you think your ass could take it?" I just kept looking at it and shrugged my shoulders. "I think you can, mate", whispered Erin as she slowly pushed me towards the bed. She then said "how about you sit on the bed for a second?" That's what I did; she then got a bottle of lube and started rubbing it onto the dildo, rubbing it up and down, making enjoyable horny breath noises as she was doing it. Erin then came over and said " well, they are no good on" as she pulled my undies from my waist and pulled them off. Here I was, laying there feeling nervous about it, only to find my cock who told my sister a different story, as it started to grow right in front of my sister's eyes. "Mmm hello" said Erin as my cock started sticking up straight as Erin grabbed it in her hand and gave it a little tug with her now lubed hand. Don't get me wrong, Erin did look cute in her outfit and strap-on between her legs. The dildo looks like a good 6 inches; same size as my cock from the looks of it. Erin was 6 feet tall, a little shorter than me, with a nice sporty PE teacher figure. Some people used to think that my sister and I were twins.

Erin then got more lubed and asked me kindly to put my foot on the bed as she started rubbing the excellent lube on my arse hole. God that cold lube and my sister's fingers felt good as she then slipped her middle fingers in my arse hole, leaving it there for few seconds, then slowly moving it in and out of my arse. I think a part of me was starting to enjoy this, I was really excited about this now, as my sister assured me she would take it nice and easy on me.  As she rubs the lube on the tip of her pink dildo and asked me are you ready? I just nodded. Part of me wanted her to stick it in me already, as she rubbed my chest and said "ok here goes" as Erin moved in and first had the dildo pressed up against my ass hole.My heart started beating more as Erin then just slipped the tip of the dildo head in. My hole felt a little hard tight and had me squirm a little. Still, it also felt good, as about every 10 seconds she pushed deeper, my breathing came heavier the further she went. Every now and then, she asked me how I felt. I just gave her the thumb saying it felt great in an authentic heavy voice; I had this ego where I was trying to look like I could handle it with no problem, as Erin finally got the thing right in and just ask me to let it sit for a minute, my ass felt heavy at the same time I felt my butt open and shut over the dildo. I'm not sure what it was, but I really did start the love the feel of it. I mean getting fucked by my sister did make me feel overwhelmed and excited.As Erin said "here goes bro going to pull it all the way out slowly ok?" I nodded as I felt the dildo pull out of my arse hole; it felt a little stiff, but once it released itself from inside me, my butt just kept pumping open and close, taking in the feeling of Erin's pink penis.

I just said "yes, please", as Erin lubed her cock again and then rubbed it near my arse hole; she then asked me to turn around on all fours, so I did what she told me, now waiting in doggy position with my arse twitching in excitement waiting for my sister pink dildo to go back in. "Ok here goes brother", as she pushes the dildo all the way in this time. She held it for a second, then slowly went back and forth. She couldn't help but cringe every time she pushed forward, but at the same time, it felt terrific. She just then reached her arm around me and gently grasped my cock; she didn't even have to do anything as my cock had just started natural growing on its own. It must really turn my sister on, feeling my cock grow in her hand as she started picking up more pace. I could also hear her breathing get more challenging as she kept thrusting her toy cock in my arse. This went on for another 2 minutes. Erin then said she did not want to fuck my arse hole too much longer, being my first time and all and she asked me to lay on my back again, so I did. This time Erin had me lay between her legs as she slipped her cock back in me and just left it there. She then took her tank top off, revealing her nice, gorgeous breasts. "Like what you see?" Erin asked. She grabbed my cock and started stroking me. "This time, brother, I want you to cum for me". As she started picking up pace, my hips started jerking to her, stroking my cock as my arse kept clamping down on her toy cock. "Yes cum for me brother dear cum for me", said Erin. It was like my balls heard her instruction as they started stirring, and my cock felt the pressure build. "I cumming, sister", I said as I leaned my hips up and then just rows and rows of white cum came shooting out. The first shot landed right under my neck as the next one shot right up to my face landing right on my right cheek as I try to duck out the way with the following 3 hitting my chest. Who wouldn't think getting stroked by my sister while her toy dick was inside my ass would have me cumming so powerful and so much? "Good boy, good boy and very impressive," Erin was saying when the cum came shooting out of me. She then got her cum covered hand and put it near my face; I did not hear her say anything as I started cleaning my cum off her hand with my mouth and tongue. She then pulled her cock out of me and just lay next to me as we just lay there, with me trying to recollect what had just happened. I mean, I can't believe I got pegged by my sister and kind of found it very hot and sexy. Erin then got off the bed and started taking off her strapon and said " look, Eric, you got my panties nice and soaked" as she showed me her wet fingers. I watched her as she slipped her panties off and said," here, Eric, why don't you sniff these for a while as I go shower first and then you can go next. So here I was, admiring my sister's panties while both my cock and butt were still twitching over the hold experience. After I washed up, I went to the lounge room to grab something to eat and drink. Erin came past and said, "Wow, that was enjoyable and hot fucking my own younger brother". "How's your butt feeling?" as she rubs her hands over my butt cheeks. I replied, "It's not too bad, sis, still twitching a little but not too bad". I would admit my butt enjoys it. "That's good. I'm going to go to bed now. Good night", Erin said as she wrapped her arm around me to give me a big hug and whispered in my ear, "Can't wait to do that again sometime. Maybe with James as well. (my twin brother). And then she just headed off to bed.