Hey, recently I've been seeing a bunch of really evil, demonic tentacle cuckold porn where a guy is forced to watch as the girl he's with gets raped before eventually choosing the tentacles over him, while he gets forced away/killed/etc.
Is there any hentai, preferably videos, where this is the other way around, with the guy saving the girl or the girl freeing herself before her and the guy have romantic sex afterwards?

There's Itadaki! Seieki, however it's more innocuous. It's not 'real' netorare because she doesn't end up picking the other guys. She just gets raped and goes back to her bf in the end.

Scenes like you described kind of defeat the idea behind netorari. Try the netori tag instead, it's the protagonist taking a girl from someone else rather than the other way around.

It's been a while since I've seen it, but I think this was the case in Makai Tenshi Jiburiru? I seem to recall the heroine was fondled by tentacles a lot, but usually escaped, and then ended most episodes just having sex with her boyfriend.