[OOC]Threadjacking: Threadjack to your heart's content, even without asking beforehand. I usually love situations that come out of it.
Backtagging: All the way! I'm a slow tagger by nature, so I tend to abuse this option myself.
Fourthwalling: Go for it!
[IC]Flirting: She'll flirt back. Assuming she doesn't start it herself.
Hugging: She'll also hug back. If it's meant to be innocent and not more intimate, she probably will be a bit confused what to do or think of it.
Kissing: Depends on the situation and the person, but she enjoys kissing in general. She'll most likely kiss back.
Romance: Catherine's always careful not to get attached to anyone in that kind of way, but since it's been possible in her canon (just in different endings), I'm not saying it's impossible in general. It would probably take a lot of development, CR and patience, though.
Fighting: In her human form, she might look like a petite girl with no strength in her arms whatsoever, but she can actually pack quite a punch, and won't hesitate to be violent if she needs to. Ask Vincent, he's seen it all. In her succubus form, she has claws and horns, and is probably even more dangerous. But she doesn't have any special fighting abilities or anything like that.
Injuring this character: Wounds that aren't too severe are totally okay. Anything beyond that, I'd like to discuss beforehand first. But I'm open to all the plotting in that regard!
Killing this character: As above, ask me first.
Using telepathy/mind reading abilities on this character: This one's a bit tricky. I like to believe Cathy can block those out because of what she is, but I wouldn't mind making an exception for some potential fun. Just contact me first!
[KINK LIST on F-list] - I'm sure there are more that just haven't come to mind yet, though. If you're unsure about something and would like to ask, go ahead and contact me!