One inner voice walks down in half steps — 1, 7, b7 — and a parked tonic becomes a story that ends at the Dominant-of-4's door. The b7 step technically borrows a note, but the engine is the falling line, not the chord.
movesinner line falls 1 → 7 → b7, then lands on the 4 chord's 3rdsolo·singshadow the falling line an octave up — it IS the melodyon recordSomething — The Beatles (C → CΔ7 → C7 → F)try itPark on your tonic for 4 bars and let this line do the writing.