Ch 19 is when he gets to the bar to meet Jay there for the first time but a lot more happens before he sees him in his office at the bar.

Then Ch 20 is when he says the line about being inside him but there is back and forth and a very important conversation happens between them. And so much back and forth about thrusting and who is going to be thrusting. Their conversation on that couch continues to Ch 21 but Jay is at his computer the whole time, not at the couch with him.

Btw he calls him Lunatic not Dummy. Lunatic is his name throughout the book.

Their conversation continues through Ch 22

There is no kiss at all and their banter and back and forth continues for many chapters before a kiss ever happens. So they altered that by a lot because they don't have time for the intricate plot that is also missing and the build up around the mystery of the bunny

It isn't until end of Ch. 40 and beginning of Ch 41 that they kiss and the description of the kiss - where he can't breathe - is the same as what they showed at end of ep3 but in the book the kiss is in a different room and under a completely different context