Erosion

[Jessica]

When a [prude] dates a non-prude and succumbs to the idea of some sexuality in their relationship, accidentally causing a sudden eruption of their own pent-up [horniness]. The word is derived from the lusty Greek god of love and horniness Eros.

[Michiko]

When a Girl [sucks] [your dick] so much and [so hard] that it actually shrinks

[Monty]

The process of eroding or being eroded by wind, water, or other natural agents.