I bloom with beauty, soft to see, yet hide sharp guards to shelter me. A lover’s gift, both sweet and wise, what am I with thorns in disguise?

I complete a martini and produce the best oil.

I can announce, but I don’t greet. I’ve got a ring, but not for a finger. Push my buttons for service.

Though dogs are fuzzy and fluffy - bau bau - dog ears can mark a page. I give you an alternative so that with your books you can engage. Traveling worlds with relative ease while your own progress is saved. Sitting neatly where you leave it, it's very well-behaved.

What's yellow and inside it, we all live?