Liz stays a good girl, but makes Josh an offer.

“Look Liz, I know it seems like we’ve broken down the Taboo barrier, but there is a big difference between licking and sucking, and going all the way. I can’t go that far.” Josh said very authoratively. “I really really enjoyed everything we’ve done so far, and I’ll go so far to say I would probably do it again, but there are some places I will never go.”

“I’m not going to **** you Joshie. I know how hard this has been for you, and you are the greatest for putting up with me and all my changes. But I don’t think I’m ready for that!” She said calmly, crawling towards the increasingly less guarded Josh. “but I have wanted you bad for a long time, and I think having fun like this will satisfy me enough so I won’t go crazy and go too far...” She gets real close to her brother’s face. “And I know you’ve loved every tiny bit of what has happened to me over the past couple days. Either there is nothing in this world that DOESN’T turn you on, or I am your perfect fantasy girl.” She kisses him on the cheek. “And at least this way we are together, so you can be there for every step of my transformation into your wet dream.” Josh was stunned by her confidence, but she made a good case. And even if she wasn’t making a good case, he couldn’t deny himself this growing giantess. “I know you love it little brother. You love watching your kid sister outgrow you. You love looking up at me. You love how muscular I am getting. And you want to watch me grow even bigger. I mean, think about how small I was only 3 days ago compared to you, my eyes barely were higher than your navel. Doesn’t excite you knowing that you could be looking at my belly button?” She leaned in for another kiss but this time she kissed him on the lips. Josh was very erect at this point. “I’ve decided, little brother, that from now on, only you are allowed to trigger my growth. I think I’ve proven that I’m not trustworthy with that decision. But also I think you really want to see how big I can get, don’t you?” She smiled at his erection, and patted it lightly before taking away her hand. “God, just think, even my nipple is bigger than your penis.” she whispered in his ear, and then noticed him ejaculate. She looked into his eyes with longing, then leaned in for a long kiss. Thrusting her tounge into his mouth, Josh suddenly backed out as soon as he felt her tongue, but Liz just warmly smiled and rolled him over beside her, snuggling her breasts up to him as she started to drift. “Goodnight little guy.”

Josh knew this really isn’t the most important question he should be considering, but this was the only question that was bouncing in his head after his sister’s little speech: “And how exactly do I make you grow?” he asked carefully, obviously very much wanting to be sure of the answer. Liz’s eyes popped open with a grin. She stared into her brother’s anxious eyes and answered.

“Oh you aren’t sure? Well maybe it’ll be more fun for you to find out in that case.” She grinned and closed her eyes. Josh thought he had a pretty good idea but wasn’t close to sure. He was really hoping for even the smallest hints. But right then a hardening something bumped him in the stomach. An excited light went off in his head and he turns away and attempts to sleep, knowing it to be near impossible with all the thoughts he was having, and just jerked off until he fell asleep.