And their mother stared through the glass, licking her open lips in envious emulation.

What would those naughty kids do next? she wondered.

Whatever it was, she was going to watch it.

Tommy's balls were hanging slack now, but his prick was still angled up, stiff and swollen and spunky. His sister was cycling his cock as she licked her lips.

"Jeez, Sis do you blow?" he croaked. "Well only if I really like a guy," she replied modestly. Then, with an impish grin, she added, "I like you, Tommy I like your big prick!"

That prick responded with a lurch. His potent young balls were already beginning to fill up again, inflating like hairy balloons below his rampant prick.

Belinda pushed her tongue out, showing Tommy that the pink tongue meat was laced with cum streaks. The naughty little temptress licked her lips again.

"I I never had a blow-job, Sis," Tommy rasped.

"Shall I suck your cock?" Belinda whispered I really shouldn't allow this, their mother told herself, but the woman knew damned well that watching a sibling sucking session would be a real treat.

"Want me to take your prick in my mouth, Tommy? Hmmmm? Shall I milk you off and swallow all of your hot, thick cum?"

The minx knew that her words were exciting her brother almost as much as the prospect of getting plated.

He shuffled closer to her, thrusting his cock out toward her eager face. She turned away playfully, teasing him by pretending that she had changed her mind. But they both knew it was only a pretense as did their mother as she looked on in fascinated envy.

"Suck it, Sis suck my cock!" Tommy pleaded.

He worked his prick-sinew, making that swollen cock throb and jerk. The congealing spunk from his previous cumming sizzled on the purple slab.

Belinda was panting hungrily. Knowing how delicious her brother's jizz was from the tit fucking, she was longing for a full load to swallow.