Oral sex

"Please mom..." Adam begged as he held on to the sides of the tub and felt his rock hard cock aching to cum, "please put me in your mouth."

"Mmmmm." Linda purred as she looked up into her son's lust filled eyes,"Do you want mommy to put your big, nasty cock into her mouth? Is that what you want you naughty boy?"

"Oh God yes!" he yelled imagining how good it would feel to have her lips around him, "Please mom....please suck me."

"That's so dirty." Linda teased her son as she released his dick from between her fleshy tits and began to stroke his massive man meat with her hand, "Of course we are all the way out here in deep space. All by ourselves. I suppose I could lick it just a little if....."

"If what mom?" Adam said, "Please anything....."

"If..." Linda continued as she held Adam's thick tool in her hand, "you promise that this remains just between us. No one must know. And I mean no one...ever. Not your father, sister or anyone.....ever"

Does he promise?