A question caught me by surprise-4

That was all the prompting I needed. I slip back up, brushing her lips
against mine. I wondered if she could taste her herself on me, but she
didn’t seem to mind. As we continued kissing, I felt the outside of her
folds press gently against my cock, coating it with her juices.

I considered the implications of this, the breaking of this final
barrier. These were uncharted waters we were sailing into, my sister and
I. There was no going back.

I pulled back ever so slightly, needing to see her, to see all of her.
As I looked into her eyes, every fear and doubt I ever had about the two of
us was banished. Trust and love were all I saw.

Effortlessly I slid inside her. Eventually I met resistance, but she
nodded, so I pressed further. She hissed in pain, making me stop, but she
wrapped her arms around me and kissed me, urging me to continue. I was
slow and careful, vigilant for the slightest indication that I should stop.
It never came. I kissed her cheeks, her neck, and her mouth again and
again.