Alex pondered David (let's pretend Loki introduced himself as David to hide his identity,) rather than focusing on his predicament, "You, ...", Alex scrutinized.
"Me." David flashed a charming smile, loving how he made the monkey-folk's brains struggle.
"We can hurt people, but we don't have anything that can instantly, harmlessly, do this..." Alex poked and jiggled his udder sensing new feelings inside him meaning this abomination was connected to his nervous system. "You called it magic. Who or what are you really?"
"Okay, I guess I did make a tiny lie, my name isn't David, its Loki. I am a God from Asgard, and I can bend reality to my whims."
"So you don't have magic milk, and I'm not safe from you steam rolling my life by not drinking it." Alex reasoned aloud.
"Bingo. You do catch on faster than most." Loki stared at Alex, intently... this was the most exciting part of his games, when the mouse realizes its completely cornered, what will it do?
"So you like omitting key details, and in mucking about with reality, you could probably just make me so thirsty I couldn't help but chug the milk if that's really what you wanted from me... So it isn't... this isn't about me, it's about you."
"Bravo, Kiddo!" Loki laughed as he clapped and shook his head in amazement. "Maybe there's hope for humanity yet!"
"Now that I better understand what I'm up against I think we can continue the game you're playing with me." Loki began beaming with joy. "Its my goal to get back to my normal old self, 100% human and me. I will agree to finish this milk, and in return you will return me to myself, not somebody different, not some animal, or animal hybrid... but me. Do we agree?"
"Ah-ha-ha-ha!" Loki was nearly bouncing with excitement, what delicious fun. "That, my young lad, is NOT what I offered, however... your terms are agreeable on the condition that you will spend the rest of today with me, since we're having such a splendid time, I have a fun night planned."
Alex's face fell, the small caveat triggering panic and fear to spread across his face. Loki's reaction made it clear he was going to do something else to him! Alex went back over the wording briefly wondering if Loki was the source of Djinn myths before refocusing... I'll be me, 100%, he didn't promise that Ill stay me though, well I could piss off a god or try to make it work... "So long as you mean this one earth evening and you don't mean an endless time loop or something crazy like that."
"You are such a delight Alex, you give me wonderful ideas for others, I agree." A mischievous twinkle glimmered in his eye.
"Deal." Alex grabbed the ice cold milk and chugged the rest of the glass, the liquid splashed into his belly and was magically routed back to his udder filling it and distending it until it was heavy, bloated, and needed support to not flop off Alex's lap and send him to the ground.
Loki gazed at his creation pleased... "You're sure you don't want to keep it... your body will never get fat as it is diverting all your fat resources to milk production..."
"LOKI!"
"Fine, fine. I'm just making sure. its a big decision after all..." Loki closed his eyes and snapped his fingers as a smirk crossed his face.
Alex's body quivered as the udder began to shrink. The pressure never subsided but the appendage shrank little by little until his belly was once again human and Alex felt normal, finally. Alex smiled and ran to the bathroom to lift his shirt and see his normal self staring back at him... "Yes, this is perfect."
"Not quite." Loki appeared in the doorframe looking thoughtful... I distinctly recall you saying... "Its my goal to get back to my normal old self, 100% human and me." Loki mimicked Alex's voice impeccably when he said it. "You're 100% human, and your normal self... but no older than 45 minutes from when we first met... I can fix that."
Alex realized his mistake as mild pain swept through his body. Within seconds his frame expanded, his fat redistributed and his, musculature bulged as a dense shadow appeared on his face indicating a daily shave is now mandatory if he wants to stay clean shaven.
Panting and disoriented, Alex gasped, "What did you do?"
"Your normal old self. Normal you, but older. It seems plain to me... Perhaps I was giving you too much credit... Well, come with me, the rest of your day is mine and we can really party now that you're 'of age' unless, did you mean older than this?"