Keep sucking and rubbing until she gives in

He switched to Mrs. Cooper's other tit, sucking the nipple in hard and teasing the tip with his tongue. His thumb found her clit and started rubbing it as he probed her cunt with two fingers. Mrs. Cooper gasped again and her struggling diminished a little. She still pushed against him, but weakly now. Her pussy was slick with excitement. Archie plunged his fingers deep inside her.

"Oh, my God!" she exclaimed as her hips lifted off the couch.

He finger-fucked her rapidly as he continued sucking her tit. More of her excited lubrication flowed inside her pussy as he directed his fingers upward. Mrs. Cooper moaned in need.

"Oh, Archie! Please don't stop!" Now, instead of struggling, she held his head to her breast and caressed his back.

Archie rejoiced at seducing Betty's mom. She was his to do with as he wanted.