Shuttle

The receiving partner lies on their back with legs slightly apart, positioned for the penetrating partner to establish a consistent, shuttle-like back-and-forth rhythm.

The penetrating partner enters deeply and establishes a steady, metronomic rhythm — in-and-out with identical timing on each stroke, like a shuttle moving through a loom.

The key is consistency — the same depth, the same speed, the same rhythm on every stroke. The predictability is what builds the sensation over time.

The receiving partner can use the consistent rhythm to build their own pleasure, rocking their hips to meet each stroke or remaining still and letting the shuttle do the work.

Vary the speed at deliberate intervals — slow shuttle for building, faster shuttle for approaching climax — but always return to the consistent, rhythmic baseline.

The penetrating partner's stamina determines the duration. Take breaks if needed, but return to the same consistent rhythm each time to maintain the building effect.