Oh, Susan can tell. She's overwhelmed by it, by his unbridled intensity, continually flicking her eyes open to peek at him and then letting them drift back closed so she can focus on the physicality of the feeling. When he kisses her she chases his mouth; when he touches her she shivers. She brings her arms around his back, flattening her hands against his shoulderblades so she can feel the way they shift as he moves, then runs a foot up and down his leg before hooking it behind his knee.