You are Aileron.

You are currently staying at your mother's junkyard, and have to share a bed with your eighteen year-old twin sister Apogee.

After waking up with a bad case of morning wood, and experiencing what sisterly affection really means, you are now trying to clear your thoughts with a refreshing shower.

However, having tasted blood -among other bodily fluids- your sister isn't about to let you off the hook this easily.

Disclaimer! Contains: Incest. Go figure.

This story is a sequel to Morning Glory and, just like its prequel, is a spinoff (?) of Dustchu's A Volatile Mixture which, in turn, is a spinoff of Shinodage's ask blog.

Credit for the cover goes to Stargazer!
(And yes, she's 18 in that picture; I wouldn't have used it otherwise.)