Give them a reason to leave

"Fine," grumbles Yrelle, clutching the towel around her shapely green body and scowling at you. "You think you're smart, don't you, Daisy? Well, I'm calling your bluff. I'm not going out there in this stupid little towel. I'm going to stay in here until someone comes to bring us more clothes."

"Are you?"

"Yep. And I'm going to use that time to kick your... eek! What's that?"

"What's what?" you say, innocently.

"That! Coming out of the shower drains! It looks like..."

"Oh, that!" you say, as the naked girls squeal and scamper around the shower room, breasts bouncing in the steam, trying to dodge the coiling pseudopods that are starting to emerge from the drainpipes. "I might have left a few monster eggs down there. Old dark elf trick."

"Oh my god! They're slimy!" Yrelle doesn't look so tough any more, wriggling away from the coils as they creep towards her ankle. "What are they?"

"They're only tentacle monsters. They won't hurt you. They just want to play."

"I don't want to play with them!"

"Well, they get bigger as they feed. And they feed off two things - heat, and female embarrassment. Which means this shower room is going to be full of tentacles in just a second." You smirk at her, enjoying her frustration. "Might be a good time to leave. Pity you don't have any clothes."