"Do not be too timid and squeamish about your actions. All life is an experiment."
Ralph Waldo Emerson
When Natsu books the room again for a further two days, Harry doesn't mind. It was just two days and what could possibly go wrong in two days?
The younger man had been timid in the beginning, learning as they went. By the next morning Harry had a fully sex-crazed kitten on his hands.
Two days later finds Harry standing in front of the bathroom mirror cursing out his reflection.
"Fuck, fuck, fuck, fuck, fuck."
He slams a fist through the mirror and is thankful that he'd had the common sense to throw a silencer (a pinkesh-orange magic circle that was almost bare in it's construction) at the door. A flick of his hand, a flash of a white magic circle and the mirror is repaired. His hand though is another matter. The shards of glass from his fist are gone but the scars are slow in healing.
Harry feels the vibrations of knocking on the door and cancels the magic circle.
"-okay?"
"Be out in a minute." He calls through.
He forces magic into his scars and watches as the skin knits itself back together.
When he exits Natsu is seated on the bed, the sheets bunched up about his waist, wearing a hesitant smile on his face. Even after the days that they've spent together, Natsu still acted like a blushing virgin half the time; although the other half of the time the pink-haired boy was like a sex-starved nymphomaniac. Harry liked the drastic mood swings; it tended to keep him on his toes and it drew him even more to Natsu, kept Harry interested for far longer than any of his past lovers had.
He makes his way to the bed, drawing Natsu into his arms along the way and pressing a chaste kiss against his forehead. When he looks down at the resting boy draped over his body he can't help but glare at the dark red tattoo stamped on Natsu's shoulder. The same tattoo that Erza herself wore with pride.
It was an unspoken agreement between Erza and Harry that neither pried too far into each others lives outside of their meetings. Erza refrained from calling Harry out on his shady dealings (she didn't have proof, but she knew for a fact that Harry was far from an upstanding citizen) and Harry didn't ask any intrusive questions about Fairy Tail or its guild members; merely took what Erza said for gospel and left it at that.
It hadn't taken him long to realize that Natsu Dragneel was the same Natsu that Erza counted as a close friend. He'd cursed himself out in his mind when he finally put the two and two together. He wanted to kill himself when he realized that, just hours before they were due to check out, he'd somehow fallen for the younger man somewhere along the way.