Silver - Finish his lesson hard (passive)
From Create Your Own Story
When those words leave your mouth, you're quite certain that they surprised him as much as they surprise yourself, not sure where this sudden enthusiasm is coming from. After all, this is all very new to you and you can only assume how painful it will be. But ... you're not one to go back on your word and you want to show him, you can take it, no matter how hard he tries.
"Did I just hear you correctly, David? You want it as hard as I can?"
"What? Old age got your hearing, old man? Or are you afraid you're too old to really fuck me anymore?" You don't dare back down now, but you are afraid that discussing the issue further will lessen your resolve, so you provoke your granddad, knowing this'll end the conversation and he'll get on with it. And you feel his cock press against your hole and he drives his cock inside you with a strong thrust and you bite down on your arm to keep yourself from screaming, though it doesn't work as well as you'd like.
"Be quiet! You said, you could take it, so show me. Or do you want Jennifer to see her beloved husband with a fat cock up his ass? Still, I gotta admit, your ass feels incredible!"
It's hard, but after a while you manage to relax more and it gets easier to bear. After some time you actually begin to enjoy the feeling of the cock pumping into your hole and you start to moan.
"You're starting to get into this? Great, then I can finally fuck you for real!" Not believing what is happening, you are amazed that your grandfather pounds you even harder than before, making you gasp with every thrust of his thick meat. Lewd slapping noises fill the otherwise quiet forest.
"Aww ... man ... I can't ..."
"What? Is my dick too much for your poor ass? Does my pompous Grandson want the "old man" to go softer on him afterall?"
You barely get the words out, but somehow manage to speak up between your moans and gasps. "N-no ... I can't ... "believe it" ... but I want you ... please, fuck me harder ... deeper." Obviously not expecting you to say that, your grandfather is still for a second.
"Your ass is insatiable! From now on, I'll be fucking that pussy of yours every chance I get! You'll be spending a lot of time in my bed in the future, stuck on my throbbing erection." And with that your granddad slams his dick back into your hungry hole and pounds you as fast and hard as he can.
"Yeah ... like that ... give it to me! I'll take ... your dick whenever ... you want my ass."
"Good! Then I'll mark my territory now ... ugh ..." He pushes his dick as deep as he can and you feel him twitch inside your ass, followed by the warm feeling of his cum filling you up. This turns you on immensly and you feel your balls contract and when your grandfather moves his dick slightly, you shoot your own load against the tree.