First, yum, powerful Harry making me melt.Harry smashed headlong against the resistance, bearing it down with main strength, willing it to yield to him as all things did when he was in the middle of a potion.

That was wonderful - sexy with Draco's hand splayed on Harry's stomach, sexy with Harry's magic so strong and on the edge of control, sexy with Harry's mixture of confidence and nerves. And Draco's appreciation of the power? Awesome!
For now, he simply wanted to lie still, and feel his arms shake, and think about the moments when Potter had seemed to exert the gravity of the sun while Draco held him.