I write fantasy novels for grownups
Do you like fantasy novels with realistic, complex characters, fantastic worlds with Elves, Dwarves, Men, Fairy Queens or High Priestesses, where battles of the mind and the heart are fought as well as battles against uncanny enemies? Epic, heroic, historic Arthurian fantasies. Tolkienesque or G. R. R. Martin (with healthy relationships and without the incest and rape. Why does G. R. R. not have any positive relationships between his characters?)
In other words, not YA.
I prefer to be realistic about all aspects of relationships in the books I write. So, good friends will joke with or tease each other, interpersonal relationships will grow, expand and become intimate. That’s how those things work, although I don’t tend to get graphic. That doesn’t mean they don’t enjoy it or that you won’t know what they’re doing.
So yes, there may be some sex as there normally would be between two people who care deeply about each other. Sometimes relationships aren’t easy, sometimes circumstances, time or distance have effects on friends and lovers. Sometimes things go wrong. Sometimes people do. That’s reality.