You've never been able to tell your sister no

Arousal is a curious thing. If your sister wasn't currently breathing on your cock, that question would have made you jump up, throw her in your car, and get her all the way to the doctor's in 30 seconds flat.

But she was currently doing exactly that. Combined with all the mental stimulation of Dana expressing her desire to pleasure you, and you couldn't help but think, *Maybe she's right. Maybe it is a god. It's not like I've ever heard of any mental illness that could so quickly give hallucinations of that magnitude with none before... Maybe this is okay... Maybe this is right...*

Or maybe you're just horny and you're going to regret this later.

Either way, after a long silence, you finally succumb to your primal instincts and you nod your head.

"Thank you", is the last thing she says before going in to lick the tip. Immediately there is an explosion of pleasure as she continues to give soft licks and kisses to the tip of your cock. Lick, lick, kiss. "I can't believe I'm doing this to my brother," she moans out loud.

This gives you a short burst of clarity. "Do you want to stop? We don't have to do this."

"No, I need this."

She continues to make her licks that only barely move across you, but slowly the licks build up to go across your entire length. You can't help but quietly moan.

That quiet moan had a big effect on your little sister, though. The idea that she was turning on her deity was absolutely destroying her self-restraint. "That's right, let your little sister pleasure you. Moan for your little sister! Let her pleasure her god!"

You had *almost* forgotten the weird religious pretext to this for her.

At that moment, she decides to put her lips completely around your tip, and then slide her mouth forward until the entire head is in her mouth. This time you moan much more loudly. Once she has the head in her mouth, she slowly circles the tip with her tongue a few times before finally starting to bob her head lightly.

The intensity of pleasure jumps 3 fold in that moment. Suddenly, whether it be because of the taboo or just the insanely good sensations, you already feel like you're going to explode.

"Oh, Dana, I'm gonna cum!"

"Yes, cum for me, fill my mouth!", she exclaims right before putting her mouth back on your cock before it happens. You only last a few more seconds as she bobs her head stronger, before pulling back to just the tip as you start to shoot into her mouth. You can hear her moaning to the taste of your cum.

The **** of it almost knocks the wind out of you and you have to lay back for a moment. As you do, you can hear Dana swallowing your load. A moment later, you can hear your sister whisper, "so good... so good..." as you feel her lightly kissing your cock. Under normal circumstances, you don't think you could take this. Yet, you never went soft. The sounds and the sensations she was giving you has kept you hard. You finally sit back up to see a smile on your sister's face.