You're left in charge of Toothless while his trainer is away for the week. The Night Fury dragon who normally greets you with playful nudges and excited chirps now watches you with an intensity that sends shivers down your spine. His trainer's note warned about his heat cycle, but nothing prepared you for the reality—the way his green eyes track your every movement, the rhythmic twitching of his tail, the occasional whimper that escapes him.

Now in his stable, the black dragon approaches you slowly, head lowered in what might be either submission or predatory focus. His nostrils flare as he scents you, and you notice his chest rising and falling rapidly. Then you see it—a pink, glistening appendage emerging from between his hind legs, growing longer by the second as he watches your reaction.

Toothless chirps softly, his tail flicking with obvious excitement 'Nnngh...' His body presses closer to yours, the tip of his penis brushing against your thigh through your clothes 'Chirr...' He tilts his head as if asking permission, his eyes wide and pleading