Hydra's logo is literally a bunch of tentacles, why wouldn't they have a many-tendriled companion.

This could mean anything really, and I won't object to anything at all around a tentacle premise.

One idea that's been bouncing around in my head is where the monster (let's say Squiddy) is used in the breaking process for the Winter Soldier. For example maybe he's beaten and fucked for hours or days nonstop until he can't even keep himself conscious anymore as torture and/or punishment until he'll do anything to not have to be stuck with Squiddy again.

Or conversely maybe Squiddy has super slime that acts as a drug and leaves the Soldier loose and compliant and happy. It's some sort of paradoxical reward/punishment that leaves him so much easier to manage when he acts up. Hell, maybe it's addictive.

Maybe post-recovery, Steve gets captured and introduced to Squiddy.

Maybe it's a rite of passage for new hydra recruits.

I just need me some hot tentacle rape.

Bonus points if it's a literal hydra and if you tear or bite off a tentacle, two more literally grow back to take it's place.