Enough information!

Just as you close an illustrated book, Cenys appears at your side. "It is time. We should not let the Queen wait."
You get up and slap her butt. "Very well."
She gasps, then giggles and leads you out of the library, down some corridors, and into a very cozy looking room with dark wood paneling. Sculptures of naked women with flowers, candles, books, spears or scales adorn the corners, and large paintings of girls in very explicit poses cover parts of the walls. One particularly interesting oil painting shows no less than ten elves engaging in some very depraved acts with each other. Nice.

The center of the room is a wooden table, with one large chair at its top end and two smaller ones beside it, as well as seven chairs on each side. The large chair is occupied by a woman of such beauty that you almost forget to breathe for a moment. White, flawless skin, coal black hair, hauntingly beautiful eyes, a partially transparent, but still incredibly classy blue dress - Queen Cenya. She has an aura of authority and grace.
To her right, a younger girl is seated - her daughter Ana if you recall correctly from the drawings in the library. She has full, luscious lips and her mother's piercing eyes as well as her beautiful dark hair. Her dress is dark red, a bit less opulent than the Queen's, and a little less revealing.
To the Queen's left a third black-haired woman sits. She, too, has pale skin, bright blue eyes and full lips - High Priestess Nywa, you assume. Her purple dress has a deep neck, and unlike the other two, she wears no jewelry.

"Your Grace, John", Cenys says with an obsequious voice.
You feel the three women's eyes on you. "Thank you, Cenys", the Queen says with a voice that could only be described as authoritative and extremely erotic at the same time. You feel your manhood harden. Damn it. This place is dangerous.
Cenys does a curtsy, turns around and leaves the room. You step forward, not sure how to proceed. "Your Grace", you say nervously.
"Please, sit", she says and points to the empty chairs at the sides of the table. You nod and do so, taking a seat right next to Princess Ana who gives you an ambiguous smirk.
Suddenly, several young girls enter the room and bring food and drink with them. Everyone gets a plate and a goblet, and big plates with meat, fruit and bread are put in the middle of the table. A blonde girl pours mead in your cup, and you begin to eat after the Queen takes her first bite of bread.
"I'm sure you must feel a little overwhelmed by your arrival here, John", she says. "I assume you have already tasted the fruit of this island."
Is she talking about sex?
Before you can answer, she smiles and continues. "Do not worry, you have committed no crime. You have done what every male would do when finding himself on an island full of women.
You smile nervously, trying not to ogle her body - or that of her daughter- too much.
"Have you taken a liking to my daughter?"
You cough on a piece of apple, not having expected such a forward question. "I... uh, I'm very, yes, she's very pretty."
The Princess smirks and blushes very slightly. Queen Cenya barely changes her expression. "How would you like to marry her?"
Again, you can't quite believe what you're hearing. "Marry her?"
"Yes", the Queen nods. "You have marriage among your people, yes? It would mean you can fuck her whenever you want."
You start to doubt the reality of this conversation. Maybe I'm dreaming. Maybe I have gone insane. But you decide to just match her forwardness.
"I was under the impression that every girl on this island wanted to be fucked anyway?"
All three smile. "That is quite true", the Queen admits. "But you'll understand how we are nobility and require higher standards than that. We do not let our urges govern us. If you marry my daughter, however, her bed is open to you - and so is mine. And since it would make you a nobleman by law, you would also have the right to fuck every priestess whenever you wish - including the High Priestess here."
You need several seconds to deal with this information.
"And... could I still..."
Cenya smiles. "Fuck lowborn girls? Of course. You only have to do your duty on my daughter regularly to create some heirs."
"May I ask why you are offering me this? The hand of a beautiful Princess, your own body, nobility - all for a poor sailor with no land or wealth?"
"Maybe you have noticed already that it brings great glory to an elf to mate with a human, and their daughters are said to be more powerful. I would like to introduce that into my family."
You nod. "It's a very tempting and generous offer, but may I ask for some time to consider?"
"Of course. You'll be provided with everything you need here. Take your time."