Ultimately, you talk yourself out of running. Nicole/Nike could easily outrun you, could fly, and...you'd have to probably face her tomorrow at school. Plus she had honestly put her trust in you, and breaking the trust of a being way more powerful than you is definitely a bad idea. Not to mention Zeus might take offense and send a thunderbolt down your spine and that would be bad. So that left going back down and seeing what it was that your goddess girlfriend (literally) had planned for you.
You go back downstairs to the game room and went inside, and said, "I'm back, Nicole...er, I mean, Nike."
Nike smiled and looked over at Zeus, holding her hand out. "Told you he would come back. Pay up."
The god grumbled slightly, which you would have almost confused for the rumble of an approaching storm, and handed over a few gold coins. This didn't seem to satisfy the goddess of victory as she said, "*ahem*In a usable currency for this country, please." And with a further grumble, the coins changed into a ten dollar bill.
"Wait, you two were taking bets on whether I'd run away screaming at this news? That my girlfriend is a goddess?" you said with a raised eyebrow.
"Completely his idea." Nike answers, unfolding her wings to try and look innocent like an angel. You're not sure if you believe her, but you weren't really offended. Your girlfriend then turns to Zeus and asked, "Now, this hourglass of Chronos will work, right?"
The king of the Greek gods nodded and replied, "Once turned over, time will slow until the sands no longer fall. Gods won't be affected, and its bearer is immune to its effects as well. Though I fail to see why you wanted to borrow it, Nike?"
"Because what I have planned for David may very well take a lot longer than we have left for tonight, and we have school tomorrow that I've no intention of missing. Or letting you miss, David." Nike said to both you and Zeus.
Zeus chuckled slightly, and then presented a small hourglass tied to a golden necklace in such a way that it wasn't impeded from being turned over. While it didn't seem any more ornate than that, for such a small thing it felt somewhat hefty. It had to be the hourglass they were talking about. When you looked up again, however, Zeus was already partway up the stairs as he said, "Very well, I'll leave you two to your plans. Though perhaps next week you can teach me how to play this...darts game you've described the other day?"
Nike nodded and said, "Shouldn't be too hard." and then Zeus left. You had no idea if it was through the door or simply vanishing, but you nonetheless felt a bit relieved to be out of his commanding presence. And while you still wanted to know what her plan was...you needed a nap.
About an hour later, you found yourself on a couch. Looking around, you recognized your location as Nicole's game room. Was everything just a dream? A look at Nicole next to you, wings still in full view, strongly suggested no.
"Afternoon, sleepyhead. No, you weren't dreaming. Unless you like dreaming about old guys that look like they could bench-press cars before breakfast, but I doubt it." she winked jokingly.
"Um...no. No, I tend to dream about tall girls. Especially ones with feathery wings that happen to be Greek goddesses." you said.
"Well then, if you'll just step outside with me, we can begin my plans for you! I know you're going to love it!" Nicole/Nike said happily, as evidenced by how her wings rose up with her mood.
Unsure what this would be, you followed her outside and she closed the door behind you. You then asked, "So what are these plans, Nicole - I mean, Nike?"
With a smile, she said, "Either name is more than fine by me, David. As for my plans..." she reached over to the hourglass hanging on your neck and turned it over, causing the sand now at the top to slowly pour to the bottom - and time seemed to suddenly almost stop. Nicole then announced to you, "Until the sand runs out, I intend to make your fantasy of really tall girls reality!"
As soon as she said that, the winged girl began to grow. Soon she was 10 feet tall, and wasn't stopping. You were so turned on that any and all misgivings about your girlfriend earlier melted away, and she knew it.
"You needn't worry about my surroundings. I won't inflict any harm no matter how big I grow for you. Once the sand runs out, I will return everything to normal, but...that won't happen for a long while yet. Unless, that is, you tip the hourglass back over before the halfway point to end it early. And you could tip it back over past the halfway mark to...extend the effect, if you wanted." Nike winked as she rose above 20 feet. Her clothes were growing with her, and as her casual wear served to emphasize her curves from her big breasts to her even larger posterior, you couldn't be happier.
"So, is this big enough girl for you yet, David?" the 30 foot tall winged goddess before you asked in an almost seductive tone.