Hi Nonny!!!
OH GOSH I THINK I KNOW THIS ONE!!!!!
I THINK you might actually be looking for this fic:
Out of the Woods by SilentAuror (E, 20,471 w., 1 Ch. || Post S4, Romance, Slow Burn, Flirting, Drunk Sex, Practical Jokes, POV Sherlock, Bottomlock, Possessive John, Pining Sherlock, Frustrated Wanking, Frottage, Hand Jobs, Blow Jobs, First Kiss/Time, Virgin Sherlock, Love Confessions, Soft Sherlock, Dancing, Bum Appreciation, Hanging out with the Yard) – Sherlock is fairly certain that John has taken to flirting with him of late, but can’t be entirely certain of it. At least, not until a case takes them into a forest, along with Lestrade’s team and something happens that will change everything about their lives…
Great fic if it’s not, so check it out anyway, but I’m certain it’s the one you’re looking for.