The air heavy and warm, as we sat in the bubbling hot tub under a sky speckled with stars. The vacation house was quiet, everyone else having retreated to their rooms for the night, leaving my wife’s best friend, Sarah, and me alone in the backyard oasis.

Sarah had always been striking, her features sharp yet soft, her hair a cascade of dark waves that seemed to absorb the moonlight. But it was her breasts that drew my gaze most often—large, natural, and full, they strained against the thin fabric of her bikini top. As we talked, the jets of the hot tub pushed against us playfully, and without warning, one of the powerful streams caught the edge of her top, lifting it slightly.

"Oh!" Sarah exclaimed, her hands flying to her chest as she tried to adjust the fabric. But the damage was done; the top had slipped enough to reveal more than it concealed. Her cheeks flushed a deep red, contrasting beautifully with the creamy white of her skin.

"It's okay," I said, trying to sound casual despite the sudden thudding of my heart. "The water's warm, you might be more comfortable without it."

Sarah hesitated, her eyes darting around the dimly lit yard, ensuring we were indeed alone. "Maybe you're right," she whispered, her fingers hesitating on the strings of her top. With a quick motion, she untied it, letting the garment float away on the surface of the water. Her breasts were now fully exposed, the nipples tight peaks in the cool night air.

I swallowed hard, my mouth suddenly dry. "They're beautiful," I managed to say, my voice rougher than I intended.

Sarah looked at me then, her eyes dark and questioning. "You really think so?"

"Absolutely," I replied, my gaze fixed on her. "Can I... touch them?"

She bit her lip, considering, then nodded slowly. Reaching out, I cupped one breast gently, feeling the weight of it in my hand. The skin was soft, the texture smooth beneath my fingers as I massaged lightly, watching her reaction. Sarah closed her eyes, a small moan escaping her lips as my thumb brushed over her nipple.

"Does that feel good?" I asked, my voice low.

"Mmm, yes," she breathed, her eyes opening to meet mine. "Your turn. Is there something I can do for you?"

My cock twitched in my swim trunks, the desire pooling low in my belly. "Actually, there is," I admitted, shifting in the water to better face her. "I was wondering if... maybe you could use your breasts."

Understanding dawned in her eyes, and a smile curved her lips. "Show me," she said, her voice husky.

I stood up, the water sluicing off my body as I stepped out of the tub. My erection was obvious now, tenting my swimwear. Sarah watched me, her eyes hungry, as I moved closer to her. Kneeling in front of her, I took her hands and placed them on my shoulders.

"Like this?" she asked, her breasts swaying invitingly as she leaned forward.

"Exactly," I answered, guiding her closer until her cleavage pressed against the bulge in my trunks. She wrapped her arms around my neck, her breath warm against my ear as she began to rock her torso back and forth. The sensation was exquisite, her soft flesh enveloping me, the friction building with each movement.

"Oh god," I groaned, my hands gripping the sides of the tub to steady myself. "That feels incredible."

Sarah chuckled, the sound vibrating through her chest. "Good," she murmured, increasing the pace. Her breasts were like velvet around my shaft, the heat of her skin searing through the fabric of my swimsuit. I could feel the pressure mounting, the pleasure spiraling higher with each stroke.

"Keep going," I panted, my head falling back as I surrendered to the sensation. "Just like that."

She did, her movements becoming more assured, more deliberate. I watched her, her face a mask of concentration, her lips parted slightly as she focused on her task. The sight of her, so intent, so close, was almost too much to bear.

"I'm getting close," I warned her, my voice ragged.

"Then let go," she whispered, her eyes locking with mine. "Let me feel it."

Her words were a catalyst, pushing me over the edge. With a final thrust of her breasts, I came, the release explosive, pulsing into the space between her cleavage. Sarah held me tightly, her own breaths coming fast and shallow, as we rode out the wave of intensity together.

When it was over, I sank back into the water, my body slick with sweat and splashes. Sarah smiled at me, a mixture of satisfaction and amusement playing across her features.

"Wow," she said, her voice soft. "That was... unexpected."

I laughed, a little nervously, running a hand through my wet hair. "Yeah, it kind of was."

We sat in silence for a moment, the only sound the gentle lapping of water against the sides of the tub. Then, Sarah leaned closer, her expression serious.

"What now?" she asked, her voice barely above a whisper.