The constraint is always raw material. She has no shortage of ideas or time in which to put them into practice. Hence, she is most avaricious in acquiring hearts whenever an opportunity presents itself. Having a stockpile means she need waste as little time as possible.
"Beautiful as the lightning or the tiger is beautiful - it'd be quite terrifying, I imagine, to be weak before you."
The Yew Queen seems to have quite a large selection of poetic turns of phrase to describe Shade. Some of them get a bit ridiculous, though from the way the Yew Queen's grinning that's probably on purpose.
And if the Yew Queen leans in, brushing her hand against Shade's hair amidst one of her many compliments?
"So exceptionally lovely..." the Yew Queen murmurs, leaning in until she's quite thoroughly in Shade's space. Not touching, not yet, but she's warm and her breath ghosts over Shade's cheek.
"I am, aren't I?" She reaches up to run her hands through the Yew Queen's hair.
"I'm sure you can find a way." Shade pulls her head closer for a kiss.
Mmmm.
Eventually they'll probably need to breathe. Or Shade will, at least - the Yew Queen can substitute with magic for a time.