Fic said:
Though it's been a while since Lucy and Erza were exposed to the love potion, its potency, and their sapphic lust for one another, haven't diminished in the slightest. It's not uncommon for either girl to surrender to her arousal and initiate sex with the other, whose weak protestations at the surprise lesbian tryst are patently insincere.

This time, Erza finds herself being groped by Lucy from behind, as the latter works a different kind of magic on Erza's amenable undercarriage.