Excited

Nathan could feel his cock hardening with his pants and knew that it would be noticed. Isabella grinned as she moved away from her brother and noticed the raging hard-on, her eyes widened with excitement at the sight of such a spectacle. Nathan watched as Isabella's lips curled upward into a satisfied smirk as she parted them to mewl; "Well well, isn't someone excited to see little old me."

His sister's mocking tone made Nathan even more aroused as a bemused look crossed her divine features. For a moment all was quiet between them as Isabella strutted around her brother, subtly inspecting him. The silence was broken by a domineering tone as she parted her crimson lips to speak; "I'm sure I can help you with your little arousal issue Nathan, under one condition."

Nathan grimaced slightly as he parted his excited lips to respond; "What's the condition?" A loud slap could be heard as Isabella placed a firm hand on her brother's rump. Nathan groaned with contentment, as Isabella wandered into his view and spoke once more; "Going forward, we are no longer siblings. I have a feeling you desire to be a Sissiboi of which I have one in my service already."

Isabella's formally caring features shifted to sterner expressions as time passed. Her lips twitched once more as she continued; "I'm sure in time you will become a loyal yet submissive Sissiboi eager to serve your Mistress and nothing more " Nathan shuddered with a mix of arousal and horror as he watched Isabella's lips twitch one last time; "Kneel before me, Nathan."

In one swift motion, Nathan was down on his knees looking up into his sister's cold domineering stare. Isabella's lips twitched as she parted them to speak; "Know this Nathan once this is done there is no going back, do you wish to proceed?"