"It's okay. I'll put all of your clothes in the wash and you can borrow some from me. If anything doesn't make it through the wash then you can just keep whatever of mine fits you comfortably," Archie nodded. "And yep, you sit in it, rub the soap and the bubbles and the water all over you, then rinse it off again-"
He might offer to wash Wren's hair later, if the other didn't really know what to do with it.
"Hm?" Archie looked bemused at the question, looking between Wren and the bath. "Oh! No, no, not really. They're just kind of fancy and smell nice. I thought you might prefer to keep yourself partly covered up, since we're strangers." He shrugged his shoulders gently. "I didn't want you to feel..." exposed? vulnerable? either of those things. "You can have your privacy." He and Eli tended to wander around their rooms barely clothed a majority of the time, but that didn't mean it was everyone's cup of tea.
"Do you need me to help with anything or shall I leave you to it for now? I'll only be next door in my room. We can talk if you like? Whilst you wash?"