Ali is almost entirely non-verbal, but that doesn't matter to him or his boyfriend Zach, who is also on the autism spectrum. They have their own ways of communicating with each other after years of being together. It's why they work so well together, and it only strengthens their bond as a couple.
So when Zach comes home from work one day and both of them are craving some intimacy, neither of them has to say anything to know where they're going to end up. Besides, Ali doesn't need to talk when his mouth has other things to do ...