Our Promise

We both have very healthy libidos, so the lockdown was a real pain for us.
We knew when each other was masturbating, as the wall between our bedrooms is paper thin.
One evening with our parents working in my dads garden work shed, I hear Rob enjoying himself and decide enough is enough.
Your life can change in moments, and ours has. Opening Robs bedroom door, I was shocked to see just how big my little brothers cock is.
But not as shocked to see he had a dildo sliding up his arsehole.
His face was a picture as he looked at his older sister naked in front of him, and knowing I'd witnessed him fucking himself.
Not giving him a chance to back out, I walked over, took hold of Robs cock and lowered my head to suck on the large bulbous head.
He froze for a few seconds, but soon began to buck upwards into my mouth. I knew then my brother would give me what I wanted.
He'd let go of the dildo, but it was still right there next to his asshole, so as soon as I released his cock, I slid the dildo back into his ass.
At the same time I put my thighs over his body, sank down and felt pure delight as my brothers cock entered me.
There was no going back, I'd showed my hand so to speak, and I'd never wanted sex so much.
Looking down at his face as I fucked him with the dildo and my pussy, Rob looked like he was in ecstasy.
We began to move together, but fucking his asshole became more difficult, so I let go of the dildo. He immediately shoved it back in and that's when I had my first orgasm.
It was so strong, I found myself falling forwards so our faces were near to each other. Rob used his free hand to hold the back of my head, pulling me closer and we kissed.
Kissing him and fucking him, with Rob still using the dildo, was all too much for little brother, and a few seconds later he came deep inside my pussy.
He drained his balls up my vagina, but I was on birth control, so I wasn't worried.
What I was, was still horny.
Climbing off of him, I moved around, picked up the dildo and as I rubbed my pussy into his face, forcing him to tongue me, I slid the dildo up his ass and sucked in his pussy cream and cum soaked cock.
I lost count from then on, just how many orgasms he gave me with his tongue. It turned out my seventeen year old brother really knew how to tongue and suck on my pussy and clit.
By the time Rib came for a second time, making me swallow his watery cum, I was exhausted from my own orgasms.
We lay together and talked about each other's sexual likes. I discovered Rob hadn't been fucked yet, but wanted another guy to use him like a female. I also found out he wasn't a virgin, having fucked a girl I knew.
He told me he'd always liked me sexually, well when he found out what his dick is for. And had masturbated a few times listening to me frigging my clit.
As for me, I let him know I expected him to fuck me every day from then on, as my sex drive was just as healthy as his, if not more so.
And so it was.
From then to just this morning, Rob and I have had sex. We've become amazing lovers and I've even spent time just fucking him with a new dildo we bought.
He's still a gay virgin, but I think that will be ending soon, as he's been chatting to an older guy on the internet, who wants to fuck him.
Our little secret is safe as we've both kept our sexual exploits to ourselves.
We have no plans to stop having sex, but if either of us wants to, to enjoy sex with others, that's fine. However I doubt given we can't stop wanting each other, it will stop anytime soon.
We've also made a promise to each other. No matter what throughout life, we'll always have each other, in every way.