The succubus grinned widely as Niarra spoke, giving the girl's breasts an appreciative squeeze.  "Mm, don't worry.  You'll be feeling this plenty... especially with this," she said as she dipped a finger into the vial of virgin blood and drew the same heart pattern she had made on Lyla.  Once the mark was finished, she began to thrust harder into the girl and started to tease Niarra's clit with her fingers, gently giving the soft nub a squeeze.  After a few more moments, she grinned and pinched the elf's nipples hard, giving them a slight twist as well.