All right so been watching Death note the anime and well of course have come up with a twisted idea on it.
The premise of the anime if you don't know is a Demon drops this notebook into the human realm And the human that picks it up writes a name in the note book and that human dies.
Well the spin is we will call it Sex note.
This could go in a different directions but I am thinking any pairing could work.
MC picks up the Sex note. Finds out that he can write a name in the note book and a description in it and it takes effect. Am thinking for this could do a transformation, perhaps give urges to Yc for sexual acts . The sky is the limit in that I think all set on whatever the limits are.
A rough idea but if interested and want to figure out the details feel free to send me a pm