You sit there, dumbstruck. Your little brother is kissing you, passionately. "Tommy," he says as he breaks the kiss, "I'm sorry about back there, I just couldn't hold back. It's just that... I've always looked up to you and over time, that admiration turned into... love. I love you Tommy."
You couldn't believe it, your little brother was romantically interested in you!? "W-Wait, you're gay?" you ask. "Close, I'm bisexual. Jack's had his way with me, as has Molly and a few others. But I always had this fantasy that you would mount me and fuck me while my big dick spurted over and over. I always came hardest when I thought of that."
"But how? I have this tiny thing and you have that monster!?" you say bewildered. Your brother want you to fuck him, even though his dick is triple the size of your's.
Suddenly you feel a pressure welling up inside your crotch. You watch with a mix of arousal and shock as your 4 inch dick begins to grow, as do your marble sized balls. After a while, the growth stops and you're left with a magnificent 15 inch cock as thick as a soda can and balls the size of softballs, and you can already feel them churning with very thick seed.
"A crazy property I found out about my cum is that it causes temporary dick growth and enhanced sexual performance in whoever swallows it. That's why I took your mouth, so we could do this. You could technically be like that forever, you'd just need a constant supply of my cum." "How long does this last?" you ask. "Most I've seen it last is a few hours, which gives us plenty of time to have some 'fun.'"
As he says the last part he gets on his hands and knees before facing his 1st grader ass towards you, shaking it seductively.
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