His arm wasn't the only thing the Galra changed. They also gave him certain... needs. Shiro learns to make it work for him.

Eddie briefly recalls some tentacle porn he’d watched just before Venom became a part of him. The copious vines holding her up and entering her every opening simultaneously. Fluids, from her or the monster who could tell, leaking from her mouth and pussy and ass. Oh, Eddie. Venom’s thought shook him, definitely not wanting to take their tongue out his mouth, How’d you keep this from us? Eddie had to be completely honest… he had absolutely no idea how he did either. ~ That good good tentacle fuckin' that Eddie so desperately wanted.

Eddie is lonely, but he doesn't have to be.

The cellular union of Eddie Brock and Venom is not without consequences. Alternatively, Eddie goes into heat (or some alien equivalent of it). It's Venom's fault. "The need unfurls inside of him—doubled but easier to bear now that it is shared. He understands what must be done, has always known. It is as basic and primitive as breathing."

What is supposed to be a special night for them takes a seemingly nightmarish turn. (AKA the one where Nicky grows tentacles.)

He wouldn’t know how to explain in any way that would make sense. Sometimes a monster fucks me in my dreams, and it leaves bruises. Sometimes I think I like it too much. That would definitely go over well.