Andrew had his fingers in Maxwell's mouth as kissed his way down and across his shoulder blades. He didn't plan to keep Maxwell in this position for long, since he was using his other hand to dry him off, but he wasn't going to waste an opportunity to show Maxwell what he was missing by not allowing Andrew to take him from behind.
Maxwell was moaning around his fingers, drooling as he made eye contact with Andrew in the mirror. Andrew didn't have his glasses on, so he couldn't see him in perfect clarity but he could tell that Maxwell liked it. The way his tongue was licking his fingers, the way his body was rubbing against Andrew, and how wet he was told Andrew all that he needed to know.