Panic

Sarah panicked as her eyes flit across her brother's limp form. She quickly held her fingers to his throat to check for a pulse, for breathing, for any fleck of life to be found. With the response being either too weak on non-existent she set to work.

It had been mere moments, he couldn't be too far gone. Sarah thought of what little bits of resuscitation she had picked up throughout her life and set about them.
Spinning Adam onto his back she began to depress on his strangely bloated chest, only to be horrified in a number of ways.

Firstly, either her brother was surprisingly frail or she didn't know her own strength, and she immediately felt his ribs bend and creak abnormally under the pressure of her hands.

Secondly, gouts of sperm erupted from his mouth after even the slightest pressure.

Had she really done this to him? She awoke to find him sucking so eagerly on her now massive cock, but why had any of this even happened?
Was he interested in her from the beginning, was it just her cock? Was it a side effect of the ****.? Throwing yourself at an **** person is a huge leap, for him to have done it to his own sister, especially after finding her in such a state is hard to believe, but if he felt he was in danger why didn't he just push himself off?
She would have noticed if he was struggling, or at least she should have.

There was no time for those thoughts now, Sarah uprighted her brother and gently squeezed his lower stomach in an improvised heimlich, watching an uncanny stream of jism flow from his defeated form. After a half minute or so Adam sputtered into a hacking cough, wheezing and spitting wildly as his body frantically clawed its way back to the world of the living.