Yes, gradually

To her credit, the older girl doesn't hesitate before replying, in little more than a whisper.

"I accept, er, my responsibility, er."

Her submissive lover looks understandably relieved by this, not to mention extremely grateful, but you need to make sure they don't slip back into old habits as soon as you let them go. Getting them naked ought to stop either running off before you're ready, so you order the pair to disrobe. They both look at you blankly, so you rephrase.

"Strip completely naked and put your clothes in neat piles on top of your shoes, up against the wall." Since neither is wearing what you consider suitable footwear, having them both barefoot is the next best thing.

Now, there is a reaction. Himari glances nervously at her mistress, perhaps concerned how she'll cope with being on the other side of the paddle, but she's used to stripping for a spanking and gets on with it. Yuina, meanwhile, looks positively panicked, but she nevertheless complies, hands shaking while she clumsily divests herself of her clothing. She takes much longer to finish and you pass the time inspecting her lover's nude form. She stands to attention, eyes downcast, obviously accustomed to being on display for a disciplinarian, so nothing is hidden from your gaze. The assessors at the airport did a very thorough job and there's not an inch below her neck that doesn't bear the marks of recent, heavy chastisement. Eventually, her girlfriend joins her, awkwardly imitating her submissive stance.

"Excellent! Now, just to be clear, Yuina, you accept that you need discipline, is that correct?"

Now she does hesitate, but only for a heartbeat, before nodding quickly.

"Out loud, please."

"Yes, er, sir." She jumps slightly at your words, but answers readily enough.

"In that case, I propose that after I paddle you both, you can come back to my room and I'll give you a little mini-assessment to find an appropriate implement for you to carry for the rest of your holiday."

The lovely brunette looks up at you in shock and shakes her head wildly.

"No, no, sir! Not carry, er. Just, er, spank, er." She motions with her hand as if smacking an invisible bottom. This is what you were afraid of and you tut gently, shaking your head sadly.

"One spanking's not going to be enough to give you the maturity that many years of corporal punishment can deliver. Frankly, even a few weeks on holiday will barely make a dent, but at least it's a start. You'll carry an implement I select for the remainder of your stay. Himari, please pass me your paddle and we'll begin."

Naked, ****, in a foreign country surrounded by dedicated spankos, Yuina's protests die unspoken and with a tear in her eye, she drops her head, giving in to your undeniable authority.