Cassidy let out an encouraging noise at the whimper, deepening the kiss once he found Soren's erection, trailing his fingers over it, just sizing it up. When he found that it just kept going, his eyes went wide and he couldn't help but smile into the kiss. He finally wrapped his fingers around his friend's arousal, pulling it out and breaking the kiss to look down. It was partly curiosity, part just needing to breathe. He started to stroke his friend in a slow, testing motion, his grip firm but casual.
Honestly, he didn't believe he was doing this, but that was half the excitement.