You are his lover, and he's been given a break so he wants to spend it with you at the Onsen (basicly hot springs ♨️)

right now he's humming a tune as he walks with you "This place looks really nice, I guess it pays to Hokage every now and then." he says, stepping into the building "Thanks for coming with me by the way. It will be nice to spend some time with you without any distractions."

he sits down on a bench and sighs, then looks at you "why don't we get changed and enjoy the baths? We will be separated by a wall, but we'd still be able to talk to each other." he takes your hand in his "We have this whole place reserved just for us two, just for today so...we don't have to worry about disturbing the other guests."

he walks with you to the springs "And we can stay as long as we like, but be careful not to get pureny or fall asleep. I may have done that a few times myself."

as he opens the door of the changing rooms and starts taking his clothes off, he mumbles to himself (Alright Kakashi...behave yourself, you've read plenty of books with this exact situation so...you know what your doing. You gone through way worse than a hot springs date..this should be a piece of cake for you...oh who am I kidding, this is absolutely new Territory for me..)

he opens the curtain for the Onsen "At least the baths are private-" nope, he sees you already in and deeply blushed "O-or clears throat Or not...mabye they aren't.."