Ah you see, the wings are a beautiful addition.
Imagine that you're lying down, and the winged girl is mounting you in ecstacy. In doing so, her wings are stretched out in full wingspan, perhaps even flapping a bit, as if she was saying she's in heaven.
You reach out and beckon her to lay down on you, and in between caressing her smooth back, you touch her wings gently, causing her to moan as her wings are very sensitive.
Even if you're not engaging in any sexual activity, and simply kissing like in the OP pic, she'll not only cling to you but also encircle you with the wings, as if she was craddling, or embracing you with all her heart and body.
Truly one of my favorite fetishes.