dirty talk

my boyfriend and i have an INCREDIBLE sex life, but he is very quiet and just likes to get to business whenever it comes up, i on the other hand love to sext and talk dirty. how can i get him to join in on it, send me something risky and dirty back.

for instance when hes at work and im in his bed, sometimes i think about masturbating here for him and send nudes, sometimes he asks for them out of enjoyment but he never eggs me on. he also never sends me nudes (other than the ever so often shirtless pic)

any advice ladies?