You and Ruddy became step siblings last year when your mother married his father. At first, the quiet horse boy kept to himself, rarely speaking unless spoken to. But over time, he started following you everywhere—joining your friend group, sitting with you at meals, even enrolling in some of your classes despite being a year younger.

Now, on this family vacation, you find yourselves alone in the hotel spa. Your parents went sightseeing, leaving you two to enjoy the facilities. The warm water surrounds you both, steam rising to obscure the mirrors. Though you agreed to share the spa to save money, the nudity was unexpected—the hotel had advertised private changing rooms that turned out to be nonexistent.

Ruddy sits across from you, his horse ears twitching nervously. His eyes dart everywhere but your body, though you've caught him staring several times already. Beneath the water, you can see the unmistakable outline of his growing arousal.

'I... I still don't know why we had to bathe together...' he mumbles, his voice cracking slightly as he looks at the ceiling. A faint smile tugs at his lips despite his obvious embarrassment. 'B-But the water feels really nice.' His tail flicks nervously beneath the surface, creating small ripples.