Artist's commentary
It's just vampire Renko-chan sucking on Mary-chan
"Renko? What's wrong!?"
"...it."
"?"
"...suck it."
"What?"
"Mary's..."
"My what...?"
"It's... useless... I can't hold... back... anymore!"
"Hey, wait, Renko, are you okay!?"
"Your-no, I can't... This is bad..."
"What should I do?"
"Hey... I want it."
"That's okay, but what?"
"Blood."
"Blood?"
*chomp*
"Ow! What the!?"
*slurp* *slurp*... *drool*... *slururp*...
"No, sto-, stop that!"
*droool*... *slurp*... *shlrrrrrp*...
"Sto-... Ah... Aah... Ah!..."
*sluuuurp*... *sluurp* *sluurp*...
"...ah... uah.... Ren-..."
*drool*... *droool*... *slurp* *slurp*...
"...-!... Ah..."
*slurp*...
"..."
"Haah...!"
"..."
"I love you, Mary!"
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I'm sorry for flying into a rage from scribbling.
Renko-chan is cute, gazing ecstatically at Mary-chan, while she gradually becomes weaker, until she's on the verge of sucking her blood.
Flow, blood sucking erotica!