Flip her over.

Reaching under her, you try to persuade her over onto her back. However, as small as she is, she's simply too stubborn to flip over with out waking her.

You keep trying, this time reaching further under her, in order to get better grip. As you do, however, you grope a small, soft of her bust and you feel the energy flow through you and into her.

Jumping back, slightly, you look around for somewhere to hide, in case she wakes up.

Before you get a chance, though, Natasha turns over onto her back, clearly irritated by whatever energy passed into her. Glancing at her small bust, you see a pair of, rapidly hardening, nipples tenting her shirt.

Waiting a few moments, making sure she's still asleep, you realise that you now know how this power works. Now, all you need to do is see what you can do with it.