1. Because he thinks the way her eyebrow furrows is cute
2. Because he thinks she has beautiful eyes
3. Because he threw the poker game for her
4. Because he's helping with her mothers case
5. Because she like's him pulling her pigtails
6. Because he bought her a dress
7. Because she's the reason he's writing again
8. Because he got angry when the suspect insulted her
9. Because watching her try and control him is more fun then Shark week
10. Because he got her an advanced copy of 'Heat Wave'
11. Because he knows her well enough to predict her moods, behaviour and dreams
12. Because she needed to know he would be back in the fall
13. Because she's his muse
14. Because he brings her coffee and bear claws every morning
15. Because it's not about the books anymore
16. Because she told him about her investigation but she didn't tell Josh
17. Because everyone notices their chemistry
18. Because he's fun and she needs fun
19. Because they banter
20. Because she likes having him around
21. Because he was speechless when he saw her in the pink dress and again in the blue
22. Because he think's she's extraodinary
23. Because he invited her to the Hamptons with him
24. Because she gets along with his family
25. Because Alexis goes to her for advice
26. Because Demming asked for Castles permission to ask her out
27. Because he was so checking out her ass
28. Because he wanted to protect her
29. Because she's jelous of the women in his life
30. Because he made her pancakes
31. Because he let her stay at his home after her's was blown up
32. Because he rushed to warn her about the bomb then broke down the door to get to her
33. Because she borrowed his jacket
34. Because she made him breakfast
35. Because he asked her out but was intrigued when she said no
36. Because he has no idea how amazing it would have been
37. Because he dreams about her
38. Because she broke up with Demming for him
39. Because she 'looks good'
40. Because she was hurt he didn't call
41. Because he was willing to buy her a pony, build a door or find a ladder
42. Because his books helped her through the death of her mom
43. Because she waited an hour just to see him
44. Because he signed a book for her as a gift
45. Because she knows his safe word
46. Because they are comfortable with each other
47. Because he brings out her fun and playful side
48. Because he slammed Demming in his book because he was jelous
49. Because 'he's all yours'
50. Because she would break him out of prision and that's a sign of true love
51. Because he already proposed and said 'I love you'
52. Because she dressed all sexy just for him
53. Because he's not ready to walk away from Nikki Heat. Not the one of the on the page or the one in the hot dress
54. Because Paula assumed that they were sleeping together
55. Because she would take care of Alexis if anything happened to him
56. Because she listens to his theroies no matter how crazy
57. Because the mark was not a hickey but he wishes that it was
58. Because they are Mulder and Scully
59. Because he was willing to turn down James Bond for her
60. Because the kiss wsn't just a ruse, it was also real
61. Because 'that was amazing'
62. Because he's saved her life on at least 4 different occasions
63. Because they flirt
64. Because her talking comics was the hottest thing he ever heard her say
65. Because he searcched for at the party
66. Because he imagined her as a ****ty nurse
67. Because he thinks the way she works is adorable
68. Because they bought each other flowers
69. Because he helped to put together a scholarship in her mothers name
70. Because he figured out what she would do with a lottery win
71. Because they have a safe word......."APPLES!"
72. Because "might want to pop one more button."
73. Because he wants to see her tattoo
74. Because she's good to Castle's mom
75. Because she thanked him for always being there
76. Because she smells like cherries
77. Because they finish each others sentences
78. Because she's his work wife
79. Because she killed her mother's killer to save his life
80. Because he makes her hard job, well, fun
81. Because "You're hot for Castle" and "You want to make little Castle babies!"
82. Because he'd do anything to make it up to her
83. Because she's a tease to him
84. Because they danced together
85. Because he can't stay out of her personal life
86. Because he let her drive his car
87. Because they went clubbing and he couldn't keep his eyes off her butt
88. Because he'd be happy to rub lotion all over her
89. Because they missed each other
90. Because she joined his fansite
91. Because they could always cuddle
92. Because she's a very good teacher
93. Because....kitten!
94. Because he really wants to see her in a bikini
95. Because she'd break him out of prison
96. Because they held hands
97. Because "you were so cute back then."
98. Because he wishes it was a hickey
99. Because ear grabbing is hot when it's Castle and Beckett
100. Because he knew her story

"He makes you feel alive but you know eventually he's just going to let you down. So why risk it?"
"Because the heart wants what the heart wants."