"Mark. I want to thank you. You chose me to be the one to bond with the symbiote and I am extremely grateful." Mark grinned at his sister. "Now let me pay you back." She said as tendrils sprouted out and tied up Mark."Karmen!? What are you doing!?" Mark frantically asked. Karmen smiled.

"I'm simply returning the favor." She said as a few tentacles ripped off Mark's clothes showing his chest and more importantly, his member. More tentacles sprouted out from the suit and began caressing his cock causing him to turn red.

"Karmen? Please stop." He said almost breaking down. Karmen just smirked even more.

"The symbiote is relaying tons of information to me and one certain bit will be useful." She said.

"Why are you doing this!?" He pleaded.

"You see Mark, when I bonded it felt so good. As a thank you, I want you to feel what's it like. I know you want a woman bonded with this symbiote but don't you want to know what it feels like?" The woman asked as a tentacle gave a good squeeze of his dick. Now erect from the tentacle, Mark can't decide on a answer.

"Well you will understand when I'm done." She said as the tendril began liquifying and encasing Mark's pole. The small gasp from his mouth only pushed Karmen to continue. "Now that the symbiote is inside you, I can now feel all the pleasure that you have and the same way the other way around." She said as the goo gave another squeeze causing a moan to erupt from her mouth. Mark stared at her confused before he realized what's going to commence.

Karmen willed the symbiote to form a huge cock to ram inside of her. As she moaned, she could tell that Mark could feel it as he started giving small barely audible moans. Tendrils from inside the suit then crawled into Karmen's vagina and thrusted over and over. Her clit was also being massaged causing large amounts of pleasure to erupt. Karmen then felt a huge wave coming and began climaxing. Because both were feeling the same thing, Mark felt his seed flowing out. As both cummed, Mark's seed was flowing from the symbiote encased stick to Karmen sending more waves of pleasure while Karmen's cum was being slurped up by the symbiote, effectively licking her pussy clean. Finally she stopped and all the tentacles retracted leaving the two of them panting from the indirect sex.

Mark looked up at his sister and said...