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So my(18F) brother (21M) and his girlfriend (20F) have been together for 2 years now. Back in September she went off to university and he stayed home to work. It wasn’t that he couldn’t get on a course or anything, he just didn’t have anything he was that interested in and was liking making money.

But anyway, after school the two of them had taken a gap year where they both worked, this was last year. Lucy pretty much moved into our house during that time. Every day after work she would come back and sleep over and have dinner and everything, to begin with I didn’t really mind, but after a while I felt weird about it. My room is right next to his and I could all the time here them fucking.

I’ve all the time wondered my brother was handsome, and he’s pretty well built so I could all the time appreciate how strong he was too. But I dunno, when I actually heard them two having sex I got jealous?

I’m still in my last year of school, so whilst he’s been working, I’ve been studying. But all that’s crucial is that it means we’re still in the same house. Once she’d left for uni I could tell he was missing her, and whenever we went out I kept noticing him staring at other girls. One night we had a bit to drink and I confronted him about it, asking if he was missing Lucy or even thinking about cheating on her.

He confessed that after living with her for a year, he’s gotten so used to having sex everyday that he was now horny pretty much always. He was really struggling not to look at other girls but didn’t want to cheat since he loved Lucy. But at the same time he was constantly fantasising about it. After talking a bit more he went into A LOT of detail about their sex life, telling me all the positions and scenarios they’d tried, he’d even offhandedly mentioned they’d pretended to be related.

I asked him if he was into that and he went shocked quiet for a moment, before laughing and saying maybe. I’d gotten really turned on from hearing about his sex life, and the alcohol had made me pretty loose lipped and feeling bold so I just straight up asked him if he wanted to fuck me.

He didn’t say anything, he just stared at me dumbfounded. So I made a move, getting up and coming to sit on his lap, looking him in the eyes. I could feel his bulge so smiled and whispered that “I’ll take that as a yes”. He started protesting about Lucy but I shushed him, I just said that we didn’t have to have sex, but maybe i could help release some of his tension. And it wouldn’t be cheating right? Not if his sister was purposely helping him not cheat by taking care of his needs.

He mulled that over for a bit as I lightly grinded on him but eventually agreed that it made sense. So I kissed him, no tongue or anything, I didn’t want to push it too far, but I guided his hands to my tits as I did so and started grinding harder. We stayed like that for around 10 minutes, him exploring my body whilst my wet pussy grinded on his bulge, eventually he came in his pants.

We both agreed it was time for bed after that, the two of us sleeping in my room, him spooning me with his big arms and I could feel his cock pressed against my ass, it felt enormous. The next morning we talked about it and both agreed that we were okay with what had happened. And that we both liked Lucy and didn’t want her to go. Which was partially true for me, I was just saying what I needed to for him to agree. After that it became a nightly ritual for us, we’d each get home from work and school, and take care of each others needs, it started just grinding and exploring, then led to hand stuff. We’d lay in bed together, me jacking off his cock and him fingering me. some kisses would be shared we realised we both had really sensitive nipples

He would call Lucy pretty often, but here’s the thing, she doesn’t really like doing phone sex. It’s just not something she’s comfortable with, couple that with the fact her uni rooms door doesn’t have a working lock and she wont even let him jack off on call to her in case someone comes in and sees. After a few arguments and him trying to get off with her, I eventually came up with a solution. If he was horny and about to call her I’d just join him, sitting off screen and stroking his cock, making sure his needs were being met whilst he could be attentive and not a sex crazed boyfriend. It was so fucking hot. The most fun I remember having is whenever he was about to cum, he’d go all tense and his voice would sound so strained whilst talking to her, doing his best not to moan and give it away. It all the time felt like a job well done whenever he came, by that time I’d tasted his cum and realised it wasn’t that bad so I’d all the time happily catch it on my tongue. It made me feel happy, and so damn horny that I was doing something for him she wasn’t

She came back for christmas and things stopped whilst she was here. i didn’t push it. Especially knowing he probably wouldn’t be horny after she’d just left, and she was around always otherwise. But once she went back to uni in january I remember getting home from school and found him in my room, he was naked, hard and looked me dead in the eyes and said that he’s missed my body. I practically came on the spot. He picked me up and tossed me onto the bed, undressing me and kissing down my body to my pussy. We’d never done oral before but had talked about it.

He was so fucking good, his tongue flicked against my clit and it was like he knew all my spots without even having to search for them, eventually he started fingering me as he did it and I don’t think I’ve ever cum so hard in my life. When i was done he lifted me over him and sat me on his face, we sixty nined as I sucked his dick for the first time, or well tried to. He’s fucking big, I’d asked him before and he’s said 6 and a half inches but I’d never measured to check. But i believed him. I’m a pretty petite girl so it was hard to fit it in my mouth, but I slowly managed, I spent a lot of the time just sucking and licking at the tip which he seemed to enjoy, slowly I worked him deeper into my mouth and made sure to use a lot of spit and massage his balls. When i could tell he was close to cumming I tried to take him as deep as I could and let him cum in my mouth

Since then the ritual has continued, every evening we pleasure each other with out tongues and mouths, when he calls now I like to make a gam of it, see how much of him i can fit in my mouth before I choke or he moans. There’s been a few times where we’ve almost fucked, his cock has literally been rubbing against my pussy before one of us decides not to. See he still loves Lucy, and whilst he’s done all this other stuff, at the end of the day it’s just to keep his hormones in check. I don’t mind. Well, I do. I want to feel him inside me, filling me up and pounding into me. But if he’s not ready then that’s fine. I’ll keep doing everything else I can to please him. he seems to be coming round to the idea of sex but In the mean time I’m happy to keep being his secret slut

NSFW: yes

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