There are a few things I like to keep separate in my life, one of which is my writing life separate from my home life. So this was a definite no-no...
After stifling my laughter, though I'm sure my eight year old caught my grin, I had to tell him--again--not to write in Momma's book. I love my spiral notebook and #2 pencil. I'm still old-fashioned enough to like the actual writing part of writing, though I contain my scribbles and scratches to note taking and chapter breakdowns. I don't use the notebook for anything other than my stories. No personal notes. No grocery lists, and no messages from cute little kids and their monster/alien hybrids. Writer life to the left, real life to the right.
I recently spoke to a group of women, and one of them asked the question I'm usually asked when others find out I write--"Where do you get your ideas?" Considering I write erotic romance in several genres (paranormal, futuristic, m/m, etc.), I can't say that I pull from real life all that much aside from being able to describe how sex can generate emotion. I don't know any foursomes living it up in a town populated by people from other dimensions. I don't know any psychics, I've never been up close to the BDSM lifestyle, and I don't have any gay friends (that I know of). I've never seen a vampire feed or a werewolf mate, and I haven't done half the crazy things my characters have done.
I have a vivid imagination. Yes, sometimes I borrow from life. That's what writers do. If your name is John and you're a complete ass, your name might make an appearance in my book as the bad guy. My character might even have some of the same physical characteristics--completely coincidental. I will say I've never used a person I've met in real life and written them completely into a book. I write fiction, and I like to control my characters and plots, well, as much as I can.
My story, my way. And no more writing in my book unless it's notes about the story. No matter how cute the monster at the bottom.