"Mary... please... you're hurting me..." Rob gasps out as Mary uses her hefty bovine body to press Rob against the wall, slobbering his face further with her long tongue.
But soon, Rob's body pushes back, expanding and bulking up, broadening at the shoulders as tiny black hairs spring up all over his body.
"No..." he groans, his voice a tad deeper as he realizes what's happening to him.
"Yes..." Mary pulls back slightly and smiles.
"H... how...?" Rob pushes with his arms, still not quite strong enough to get her off of him, but she is being pushed back ever so slightly.
"I guess I must not have swallowed all of what I put in my mouth..." Mary's grin grows wider before she darts in quickly, this time shoving her tongue directly into Rob's agape yet expanding mouth, stuffing it full with the strangest french kiss perhaps ever.