Why not?

It's been a pretty weird day already, Aaron reasoned. No point in being squeamish now.

Taking his sister's head tenderly in his hands, he guided their faces together and kissed her deeply. While she didn't have a tongue, he felt her desperately try to massage his own as he pressed it into her pussy, tasting their mixed juices as she shivered in his embrace.

Aaron didn't need to be told, his sister gasping as he began to make out with her slit as she wrapped her arms around him, holding him tightly. Her eyes were screwed shut in mindless pleasure, a trickle of tears running down her cheeks to join the fluids smeared across her face.

"I love you," her voice began to pant from between her legs. "I love you, I love you, I love you..."

It wasn't just to tease the Natalie trapped within her. Aaron felt his new sister's passion burning within her as she desperately tried to push their bodies closer together, as though through sheer **** they might become a single being.

Something to consider, Aaron thought to himself, remembering a few of the multitool's functions.

Natalie's expressions of love became a single stream of moaned syllables, her body shuddering violently in Aaron's embrace as he relentlessly made out with her, only slowing down when his sister screamed as she climaxed.

Natalie came down slowly, her body still twitching and sighing as Aaron occasionally licked her lips.

"I love you," she whispered, when she finally regained her composure. "I love you so much."

Aaron was about to respond when he saw Natalie's eyes dart sideways and a look of panic cross her features. Looking up himself, he saw Emily in the doorway of his room, frozen in shock with an expression of horror and confusion.

He had maybe a second before she screamed, ran or worse.