She's too sexy for her shirt

“I.. I don’t think that’s gonna stop…” pointing at her leaking nipples.

“Really? Mmmmm, I hope not, because its been feeling gooood this whole time.” Josh walked up to her and began to explore her breasts with his hands. “Oh shame on you Josh, only a pervert would touch his sister's chest! I only got my first training bra last week, and I only just started my growth spurt a few days ago from being half your height!” Josh lowered his hands and backed up staring at her, getting turned on by her teasing. “If you saw a guy try and touch my flat little chest a few days ago you would have used your big strong muscles and beat him up, wouldn’t you big brother?” Liz put one hand on her hip and looked to her other arm raised the other in a flex, causing a round grapefruit sized bicep to swell. “I’m too small and skinny to defend myself against guys like that, I need my much bigger and stronger brother to protect me.” She then innocently coupled her hands behind her. And thrust out her leaking breasts, “But I have been drinking my milk, and trying to grow for you, so you won’t have to worry about your small weak little sister anymore.” Josh was getting very hard again already. Liz giggled “I think I’m doing a good job so far don’t you think? I mean just think, just last week I was barely taller than your belly button, and your chest had more to look at than mine. Now I have breast's you’ve only dreamed of even getting close to before, and you are the size of a kid to me. How does that make you feel? To have your younger sister outgrow you? To watch her become hotter than any girl you’ll ever hope to get. How does it feel to get a boner from your own little sister?” She shyly said a little embarrassed and covering her mouth, “how does it feel knowing I’m gonna get even bigger? Much taller, much bigger boobies, and much much bigger muscles.” She giggled and stared at his penis straining his shorts.

“Don’t you think your body is, er Liz, don’t you think you are big enough?” Josh mumbled out.

“Oh I don’t know, if I am super hot now, I would be even better bigger don’t you think? Speaking of, lets find out how big I am! Could you find the tape measure Josh?” Josh jumped to his feet to go find the tape measure. In the mean time Liz began packing all the weights she could on the barbell, eager to see how much stronger she grew in the last 20 minutes. She put 3 100lb weights on each side first to test it, “With all this muscle (bicep flex), I bet I could lift a thousand pounds! But lets see how hard this is first.” She put one hand around the center and tried to lift, she got it barely unracked and then fell forward onto the ground with the weight causing a loud crash and heavy thud. Josh was on his way back and hurried down the stairs as he heard the noise.