After dinner your girlfriend asks you:"Do you want to arm wrestle with me?"
You look at her and answer:"yes why not?"
You are a bit confused because your girlfriend is not really strong compared to you. You have the appearance of a athlete because you are working out every week. Your girlfriend doesn't stand a chance against you. "Easy win" you think.
As you sit down at the table your girlfriend says:"let's do it nude."
You answer:"Okay" more confused but you strip of your clothes.
As you lock your hands you notice a red amulet hanging around your girlfriends neck. You also notice the slight six pack of your girlfriend and you see some small pectoral muscles behind her breasts. She must have been working out. As you lock your hands a small bulge rose up from her arm.
"Ready?" she asks you.
"Yes"
"3,2,1,go" and with that you begin to push. You are surprised by her strength so you loose a few inches but then you start to push her back. Then you begin to push her arm down. Suddenly you hear a quiet ripping noise. You look around and you also notice the dull glowing of your girlfriends amulet. Then you look at her arm and you think that it had grown a bit. The resistance of Lisa also got stronger she must have got stronger. The ripping continues and you see a small vein popping up on your girlfriends biceps. It had grown again. Slowly you come to an halt. You nearly won but now you just can't push further.
"Not so strong aren't you." says Lisa laughing "now my turn"
And with that she starts to push. The ripping gets louder and you see her biceps growing. It is still smaller than your own but it looks a lot denser. You try to push back but your girlfriend is just to strong. As you look up you also notice that her left arm also grew to match her right one. And the rest of her muscles had grown too. Her chest looks a bit perkier with stronger pecs. Her six pack had grown more defined and her legs have grown thicker than yours! She had pushed your hand to neutral again.
"You can use the rest of your body too if you want." Lisa giggles
So you put your left hand on the table. With more strength now you gain the advantage again. You push her down but the ripping gets louder again and you see her muscles getting stronger thicker and denser again. Her biceps rose up and was now as big as your one but it looks a lot denser and harder. You are starting to struggle pushing her down and one inch from victory you come to an halt.
"He he you stand no chance" Lisa says.
She was right. Her muscles were now as big as yours but a lot denser. She starts to push your had back again and you can feel the growing strength. Her biceps now eclipses yours. She pushes you back to neutral. Then her muscles have another growth spurt and she pushes you down. You use all your strength but you can't stop her. Her body now looks like the one of a professional bodybuilder but she still had her female curves. You also think that her breasts have grown a bit.
A few inches before winning she stops and offers :"use both hands."
You don't want to loose against a girl so you grab her hand with your left and start to push. You gained ground quickly but the ripping appears again. You have to end this so you stand up and push with all your strength. But the arm of your girlfriend literally exploded with ultra dense muscles. The biceps of Lisa now looked like someone implanted a big canonball into her arm. Your pushing gets slower and then comes to an halt one inch before victory. Then Lisa starts to push. Her muscles got even bigger. She pushes your whole body down just with one arm.
"This gets boring" she says.
Right after the words left her mouth her muscles began to enlarge to sizes a bodybuilder dreams off. Her bulging biceps grows to the size of a melon. Her legs were now as big as tree trunks. Then she pushes you down. You can't do anything against it.
"Easy match" she laughs and flexes her muscles. Her rippling eight pack looks like a steel-brick wall. But she had still her feminine curves.
"You can squeeze my biceps if you want." Lisa offers
You try it but it would be easier to squeeze a steel ball.
"Punch me in the belly." She says
"Are you sure?" You ask.
"Just do it." She says and flexes her eight pack. It starts to grow again. As she stood up she was now also taller than you. She had grown to 7'10". She is huge. You only stand at 5'11".
You punch her with all your strength but you instantly feel an immense pain as your hand collides with the wall of muscles.
"Ha Ha. I think now I am the boss here." Lisa laughs evilly.
Then she grows again. She now would put any bodybuilder to shame.