Saturday Night, She came over, we knocked out 3 or 4 Throughout the night, she stayed, more fun in the Morning! One cup of coffee, then she bolted.

The only contact between then and 7am today was one text yesterday, "Happy Easter. thank's for the sex "

7am

HB: "Got up this morning, could not stop thinking about you! OMG I think I'm in love with you! What do you think?"

7:45

Me:"Better slow your thoughts, I may not be able to see you anymore!"

HB: "GOTTJA BABY! April fools!!"

Me: "Fucking Jerk!"

HB: "Hate me?"

Me: "No but I have some soft rope with your name on it!...payback!"

HB; "Fuck rope, I have handcuffs!" "I wouldn't jeopardize what we got going by saying that! your the kind of guy that would get pissed off, and wouldn't get pissed on!"

Me: "Absoluteness!"

HB: "It's what attracts me? as fucked up as that is! "

Pump or Dump?

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They call me the cat whisperer, cause I know exactly what the pussy needs.

Don't think too hard about this. A friend of mine whom I wasn't interested in but had a crush on me did pretty much the same thing, but reassured me that it wasn't the case.
On the other hand, she might have been testing the waters by doing that. In this case, you'll notice a change in behaviour the next time you meet her

I agree with testing the waters.
Seems like a thought out gesture to make sure the first thing she does is text you she loves you on April Fools.
Plus what if you would have reacted positively? She's not gonna say oh i was kidding. Shit wouldn't be funny then.

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A morning of awkwardness is far better than a night of loneliness.

18 Body Language Mistakes I Bet You're Making

Yeah she was probably just testing the waters, her reaction leaves a lot of room for doubt though. If it was me I'd just keep the honesty thing you have going, it's up to you where it goes. On another note though, good to see that you're not creating a whole load of lies to keep an FWB for the sake of it and she is well aware that what you've got right now is a casual thing. I am the same way, brutal honesty is way better in the long run for all concerned than a sweet lie.