Either Queen Tavira or Queen Irellia since I feel I got more out of them when it comes to interaction.
So taking her bow is a no-no?
You can take it, but if you do, you'll never see her again.
Then again, there's no guarantee she's ever going to have more content. And the only way to see her again is to get egged, which your character might not want to do (be it because they don't like being egged or because you don't want the pregnancy's side effects), so taking the bow may be an option.
Unfortunately, it's generally weaker than Tease and there most likely will be better Lust weapons in the future, so getting the bow isn't exactly a necessity either.
By the way how long is The Queen of the Deep's gestation period? Feels like my main female has been preggers for some time now... (longer then i thought she would be anyways...)