Help!!!!! Please!!!??

So my boyfriend and I were discussing in more depth about sex it's already explosive .... Then he told me he was into the kinkier stuff I didn't know how to respond to it so I just said OK but now I'm very curious as to how far the kink hose ik he's obsessed with my neck but I also don't know how to dive into asking him my partners before having been rather vanilla only like outside sex.... how can I bring up asking him and not get vague answers like I have been I'm not against kinky stuff or trying it I just want to be very well prepared for it