Both in Lust.

I wanted to pay her back, but she wouldn't let me. Given how unsteady I was on my feet at the moment, that was probably the right choice. We had one more quarter left, and she helped hold me up under the spray to recover, instead.

“You should come join your Daddy and me in bed tonight,” she murmured against the side of my neck, instantly snapping me back to reality.

“You can't be serious!” I gasped, leaning back so I could look her in her eyes. “Daddy... he's... he's my Daddy!” I shook my head. “It's one thing, being with you... That was amazing! And you said he doesn't consider that cheating, so that makes it okay. It's bad enough knowing you're going to tell him about it now... but it was so incredible, being with you, I think I can live with that! But... actually being with him...”

“Tell me you don't want to, then,” she demanded, with a soft, understanding smile, slowly stroking my hair. “Not that he's your Daddy, or that it's wrong, or that it's impossible... none of that. Tell me right now, honestly, that you don't want to have sex with him, and I'll never bring it up again.”

“I...” My mouth opened and closed like a fish, but I couldn't get the words out. I couldn't make myself lie, not about this.

“I've seen the way you look at him, you know,” she smiled. “When his back is turned, and you don't think he'll catch you. You sometimes forget, that I'm there to see you, too. I recognize that look. I should! I've been seeing it in the mirror, ever since the first day I met him.”

“I... it doesn't matter,” I sadly lowered my eyes. She knew, and there was no point denying it now. But it didn't change a thing. “However I feel about him... you can never tell! You have to promise me, Vivian! I'm his daughter! However, I feel... he could never feel the same. He would never, ever agree to be with me, not the way I want him to.”

“Are you so sure about that?” she asked, lifting my chin with her finger until I was looking her in her eyes again. “Because he had no problem at all, letting you suck him off just now!”

“What?” I gasped, shaking my head in disbelief. “That... that...”

“That was your Daddy's huge, amazing cock you just sucked?” she grinned, her eyes flashing with desire as she thought about it again. “Yep! Sure was!”

“But... but how?” I demanded. God! Daddy had an absolute monster between his thighs! I'd never had any idea. What could Mom possibly have been thinking, to give up having a cock like that at her beck and call, any time she wanted it?

“He didn't believe me, of course,” she smiled, stroking my hair, leaning down to softly kiss me again. “I've been telling him all the trip how you've been looking at him... he was absolutely certain I was imagining things, but I knew better. And I've been seeing the way he looks at you, too, when your back is turned! And just for the record? Nothing ever gets him harder, or makes him cum better, than when I whisper into his ear that I want him to pretend it's you he's fucking, instead of me! He's in love with you, Tammy. Absolutely head over heels in love. And in lust with you too, just so we're clear! I'm not sure how long he's felt this way, he still denies it, even to me, so trying to get a timeline out of him is pretty much impossible, but I know what I've been seeing. You were right about one thing, though; he's your Daddy, and he was never, ever going to make the first move! And neither were you, of course, not without a little bit of a push from me. The best I could get him to agree to was sticking his dick through that hole for you, and letting you make the choice for yourself.”

“But... I didn't know!” I refused. Daddy thought I'd chosen to suck him off? I hadn't done that! At least, not exactly.

“No, you didn't,” she agreed, smiling with understanding. “But we never have to tell him that, do we? Because what you did or didn't know at the time isn't really the question. What matters is, if he stuck his cock through that hole for you again, what would you do now? Would you suck him off again, this time knowing that he's your Daddy?” She smiled, her eyes glinting wickedly. “Or would you turn around, and take him into your tight, sweet little pussy, instead?”

I trembled uncertainly, staring into her eyes.

“It's okay, Tammy,” she smiled, kissing me again. “You're two people who love each other, and who want to express that love, sexually. There's nothing wrong with that.”

“Even if he's my daddy?” I quivered. “You don't think I'm disgusting for wanting this? You don't think it's wrong?”

“Only in the sense of it being 'wrong' and 'forbidden' making it even hotter!” she giggled, then grew serious. “We are the only people who get to decide what is 'wrong' for us, Tammy! Not anybody else, not ever! And you are anything but disgusting! You are perfect, just the way you are, and your needs and desires are one hundred percent natural, and nothing to be ashamed of at all! I cannot wait to see your Daddy fucking you, baby, and cumming deep inside his daughter's tiny, tasty little teenage pussy! About the only thing I want more, is to go down on you after he's done, tasting him inside you and getting my turn to make you cum, too!”

I could feel myself blushing like somebody had just lit a fire in my cheeks... I still wasn't completely sure about this, but there was no faking the unabashed desire in Vivian's eyes as she told me what she wanted, that much I knew! We waited until the water ran out one last time, then dried off and got dressed, heading back to the RV.

Daddy was waiting, looking at least as nervous as I felt. That actually reassured me, in a weird sort of way. I walked slowly up to him, biting my lip. He stroked his fingers through my still-damp hair, staring deeply into my eyes. He bent down slowly, slowly towards my lips... but he wouldn't come the last little bit. I trembled, reaching up to steady myself with my hand behind his neck... and I pushed myself up onto my toes, meeting him in a kiss.

He moaned into my lips, and the floodgates opened, he grabbed me by my ass, lifting me into the air, and I wrapped my legs around his waist. He carried me deeper into the RV, to the room he shared with Vivian. I say room, but really it was just a big comfy bed (by RV standards), with some built-in cupboards and shelves. Daddy laid me down on my back, Vivian came along behind him, and the two of them together started stripping me, and each other.

Despite everything, a tiny part of me was still worried it was all some sort of terrible prank... until I once again saw Daddy's cock. It was mostly soft now, though stirring from the excitement of our making out, but it was unquestionably the same one I'd sucked off in the showers. I took it into my hand, but when I tried to lean down to suck it, Vivian stopped me and pushed me back.