Since Nitori controls the mechanical arms, I'm guessing this is either some kind of equipment malfunction, or some really weird BDSM thing. The title of the source suggests the equipment malfunction scenario.

HawkeyeNFO said:

Since Nitori controls the mechanical arms, I'm guessing this is either some kind of equipment malfunction, or some really weird BDSM thing. The title of the source suggests the equipment malfunction scenario.

I wrote a code for a virus that affects only mechanical tentacle arms and forgot about it for so long that it faded into fantasy and materialized in Gensokyo!