Her face

Drew can't believe it's gone this far. Completely lost in his lust he throws any remaining caution to the wind, "let me give you a facial?"

Tanya, still masturbating in front of her brother, is repulsed by the request but gets on her knees in front of him anyway. She closes her eyes and mouth tightly.

Drew is shocked and baffled by the girl kneeling in front of him. Did Tanya have a sexual awakening or something? "Seriously?" He hesitantly asks while furiously stroking.

Tanya thinks "no" but that answer is quickly shoved aside by her mouth declaring, "yes, Drew, cum on my face if that's what you want."

That encouragement is all her brother needs. Tanya, eyes still shut, feels the hot liquid of Drew's cum slap against her cheek, then a spurt directly on her lips, and another right between the eyes. It takes all of her willpower to not open her mouth and gasp. She doesn't understand why she feels compelled to let her brother defile her like this, yet, she's doing it.

Drew groans as the last bit of jizz drips from his cock. "Fuck, sis, you are actually really sexy all covered in cum." Tanya's brain internalizes the statement. He continues, "okay, now it's your turn. Show me how much this turns you on, Tanya. Cum for me, Tanya."

Although her fingers had still been working between her thighs Tanya had felt herself coming out of the moment as Drew shot his load on her face. However, as soon as he said she looked sexy the arousal started to build again. And, to her complete surprise, when Drew said "cum for me" her body responded nearly instantly. As she felt the wave of pleasure nonconsensually pushing itself through her body, her muscles clenching and her skin tingling, she finally opened her mouth to release a moan. As she did Drew's cum dripped into her mouth.

As the salty, bitterness hit her tongue she felt a mixture of pleasure and repulsion. Drew saw it. "Come on, Tanya, you know you want to taste it. Lick your lips for me."

Tanya's tongue runs over her lips and she tastes her brother's cum. The thought of it makes her scrunch up her face in disgust.

"Holy shit!" Drew whispers. His jaw drops.

Suddenly, the sound of the garage door snaps the brother and sister out of their lusty trance. "Crap!" Drew says, "you better get upstairs and get cleaned up."

Tanya feels her heart thump in her chest as a car door slams shut. She tries to open her eyes but the cum blurs her vision. She grabs the handrail and starts to make her way up. As she takes a step she feels Drew slap her ass. She squeals. "Don't be afraid to use your mouth as a cumdumpster and eat it all up, slut." She wants to turn around and slap him across the face but can't risk getting caught.