At the sight of Lena's blood, Vivi's heartbeat quickened even more. Before she had just been having a bit of fun, playing around, experimenting... but now she found the bloodthirst was taking her over. She could feel any semblance of empathy flitting away, and she stopped worrying about how messed up this was.
It was rare she had someone so open and willing to vent her frustrations on. She removed the daggers and yanked Lena up by the throat. "Sit up," she commanded. "And drink. Have a breather."
That was really more of a taunt, though. By the time Lena could process her orders, Vivi was already shoving a healing potion drenched rag in her mouth, also tying another gag around to hold it in place.
"That should help keep your injuries eased," she said.
She then shoved Lena down on her chin, and traced her spine with the edge of one of her knives.
She licked her lips and with her free hand gave Lena's ass a fierce slap.
Toyingly, she began to tease Lena's bruised and bitten labia with the point of the knife. Not with any real force, but razor-sharp as it was, just the gentle brushing was enough to start knicking the flesh.
Vivi began to smear the magenta gel around her genital, using her fingers to shove it inside... partly to healing what damage she'd already done down there, and partly to prepare Lena for what she had planned next.
"You know... it's not a thought I've ever had before, but seeing your pussy all vulnerable like that makes me wish I had a cock to jam in there. I don't, so I guess we'll have to make do with what we got, right?"
Vivi schlicked the knife's long handle into her own pussy, enjoying a few brief moments of the pleasure she'd been neglecting to give herself since she'd taken control in this little tryst. Using a long cloth bandage wrapped around her waist to secure the makeshift vorpal strap-on, she smeared more of the magenta jelly onto the blade.
"Get ready, Lena. The healing salve should numb you quite a bit, but it'll still probably sting a fuckton."
Vivi grabbed Lena's hips, and with a sharp thrust of her pelvis stabbed Lena's vagina with the double-edged dildo.