Happy ending is a search phrase: here it names an erotic massage booked by the hour, and the therapist sets her own limits and says them before she begins.
Few scraps of English slang have travelled so widely. The words began as the last line of a fairy tale, were taken up long ago as a knowing phrase in the massage trade, and settled into place as a search term typed late at night in hotel rooms in cities all over the world.
Because it is polite. It lets someone look for an adult massage while keeping the words soft enough to type into a search bar on hotel wifi. On this site the phrase is the name of a page and of a booking, and nothing more specific than that.
An erotic massage in your own room: warmed oil, low light and slow strokes along the back, the shoulders and the legs, booked by the hour. It sits on the menu beside erotic oil and sensual, on the same ladder, where ninety minutes cost half as much again as the hour and two hours cost twice it. The price confirmed in writing is the whole price, and nothing is added at the door.
The woman who takes the booking. She decides whether to take it at all, she sets her own limits for what a session includes, and she tells you what they are before the session starts. Those limits hold for the whole visit, and she may end it at any point. Nothing about the name of the page changes that, and nothing written when you book settles it on her behalf.
Write the phrase as you would any technique name, with the time, the address and the length. Mention a preference about pace or setting if you have one. If this is your first booking with the house, half the fee is settled electronically once the hour is confirmed, and the other half is paid when she arrives. As with every booking, the client is twenty-one or over, and so is the therapist.
The happy ending page describes the massage itself, and the erotic massage entry places the phrase within the wider menu.