"Can't you hold it?" Kira asks with a tone of uneasiness. You can feel the mix of disgust and fear coming from her. "At least until Sis wakes up? Then you can use her."
Kira's question only succeeds in irritating you. "I'm not doing that to her after what you and I just did! 'Hey, honey, sorry I cheated on you with your sister. Now could you go ahead and take her place as my dick so I can pee through you?' Why would I ever want to do something so shitty to someone I love? Besides which, I don't think I could hold it that long. I need to go, right now." You put up the toilet seat and stand there, grasping Kira's shaft lightly. "This will all be over in a few seconds. I'm sorry, but you're just going to have to deal with it."
"No! Please!" Kira pleads desperately. "Please don--" But it's too late. Kira's voice becomes garbled, interrupted by a stream of warm piss flowing through her. At first the pressure behind it is strong and steady, and you empathically feel Kira's tension as she tries to push it all out of you as quickly as possible. Within moments, though, her angst melts away, and Kira relaxes, which causes the urine to flow with much less pressure. When it finally slows to a trickle, and then you shake the last few drops from her, you can tell she's actually quite disappointed that it's over.
"You enjoyed that," you say smugly.
"N-no, I didn't!" replies Kira, a little embarrassed.
You laugh. "Don't try to deny it. You can't lie to me anymore, because I can feel everything you feel. Part of the rings' magic is that we're empathically linked now. That's why the sex is so amazing."
You could feel the tip of your penis get slightly warm. Looking in the mirror, you realized there was an ever-so-slight blush setting in. "Okay, okay, fine..." Kira confesses. "You caught me. I guess I was worried that there'd be some sort of taste or smell. But there wasn't. It wasn't as bad as me thought it would be."
Kira's verbal stumble immediately catches your attention. "Wait. What did you say?"
"I said, it wasn't that bad. It actually felt... kinda good..."
You shake your head. "No. You said, 'wasn't as bad as me thought'. Not 'I'. 'Me'."
"Me did?"
"You just did it again!" you exclaim. "Ah, damn it, Kira. You're starting to lose yourself just like Brooke and I did. I didn't think it could happen like this. I mean, when it was happening to us, we were... kind of... being stimulated sexually. But maybe the trigger is feeling pleasure of ANY kind."
"What we do now?" asks Kira. There's no doubt about it-- her mind is beginning to simplify, albeit much more gradually than yours or Brooke's did before. At least she's not uncontrollably horny yet.
You sigh, pausing to consider your options. "I guess I'd better wake up Brooke after all..."