Drop letter, add letter ..

Posed - speed

Speed - Spied

spied - penis

Penis - Skein

skein - inset

Inset - stain

Stain - Astir

astir - taser

Taser - Reset

reset - tease

Tease - Skate

skate - stale

learn - yearn

As in "I yearn to dine on a sweet, wet pussy!"

Yearn >> Years

Years >> Tears

Tears - Tease

Tease - steed

steed - edits

Edits - staid

staid > dates

dates - adept

Adept - spade

Spade - deals

Deals - Asked

asked - cased

Cased - Cread

Cread - Padre

padre - repay

Repay - spray

Spray - Paris