A Vacation With Passionate Kisses summary:

Jun, the sucessor of a rich family from Tokyo visits Okinawa in the middle of summer to attend a wedding ceremony. However, his father who was supposed to be waiting for him at the venue abandons him, leaving him a letter that says "Work hard at this inn"...!! As Jun is wandering about under the blazing sun, Natsumi, a handsome guy, offers to take him to the inn. As it turns out, he actually works there. Jun's heart starts racing when he hears that that they're going to live under the same roof and work together. "Well, you had this longing expression", Natsumi says after his hot tongue found its way inside his mouth.+