Found the clips of the DLC.
Part 1:
https://www.youtube.com/watch?v=ufjE_Ev0c_k
Part 2:
https://www.youtube.com/watch?v=zpgVArwTo2k
From the looks of it, I think its more of a Breast Transfer between Mirai and the main heroine. Too bad the process happens off-screen though

I had high expectations for this.