where's the sex scene which chapter is itლ(´ڡ`ლ)

This is like shounei ai, there is no sex scene, If you want to see an actual scene, you have to read the extras.

sex scene are in the extra stories

sex scene are in the extra dj stories : how to live with a beast and last story

I think some of the totally captivated dj's under other manga by this author have some sex scenes, but I only read one