She uses them to clean up

Astrid giggled again, still staring at your penis.

"Sam I'm sorry, I know you want to cover your little mini-penis up, but unfortunately there are, erm, bigger issues we need to deal with here! Namely, this mess you made!"

Astrid gestured towards her body, still covered in your cum.

"Sorry, but I need those boxers more than you do, buddy," she said.

With that, she scampered down the ladder and unhooked the boxers, then climbed back up. Still totally naked, she uses your boxers to wipe up all of your cum. Then she looked at them, and back at you.

"Sorry Sam, I know you'd like to cover up, but well... it wouldn't really be sanitary at this point." With that, Astrid shrugged and tossed your boxers back through the trap door! You gasp in shock. You are now totally naked, hands cuffed behind your back, with absolutely no way to cover up!

Astrid then threw her shirt back on, meaning you were now the only one exposed! She laughed again as you blushed in total humiliation.

"Look Sam, it's really not a big deal! You got a cute baby dick, and there's no reason to be ashamed." She looked at it closely, squinting a bit for effect. "It really is adorable. Especially now, all shrunken up! Have you ever gotten a physical done? If I were your doctor I would like, want to write a paper about your itty bitty wiener. Get all the nurses in to give their assessments, take tons of pictures... I don't know, it's just so interesting! Can I poke it?"

"No!" you yell back, already embarrassed enough as is. You jump away from her, causing your dick to bounce up and down, which makes Astrid laugh again.

"Okay, okay, no need to panic Mr. Mini Penis! We should really get going though! God I have got to show Sasha this, she is going to think it's the funniest thing ever!"