She wants to have sex with you.

"I think we can let you go now," Kako says after a giggle. She loosens her grip on your cock so you can slide free. "Now you will know what it's like to be me...having to haul all of this cum around just to please you. Now let's have sex." She shooes you to stand. Your sac rests on the floor. Kako guides you to straddle your gigantic organ, then she has you sit. She scoots you back until your ass hangs off of the back. She squats behind you, and pops out your plug and replaces it with her penis. She feeds her entire cock into you again before she starts fucking you. She must not have liked the angle, because she stands erect and takes you with her. She just lifts you by the hips and uses you to masturbate herself. She turns you at various angles to the mirror so you can enjoy watching your body as she raises and lowers you on her cock. Despite your size, she is lifting you completely off of the ground without any strain. You groan as she deposits more cum inside of you.