If she really likes him, it must be part of the appeal, right? That he's just so incompetent and pathetic. That consequently his other half has little experience but plently of enthusiasm.

For a moment that comes out in his kiss, between his nerves, the way she grabs him and the heat and insistence of it, his blood quite literally boils for a moment. Boils into causing a change, though it stops short of taking hold, it's enough to push Robert to take her in his arms with more strength than he should have. And it's enough that his kiss is just as strong.