The pill kiss is a sign that Vegas’s perspective of Pete has changed, that he’s not going to hurt him—that he’s glad he’s alive. The escape kiss is a callback to that: Vegas’s attempt to show Pete that he genuinely does care for him, that he knows he’s wrong, that he not only needs but wants Pete by his side.
I feel like Vegas and Pete kissing show me that part of them, being like exposed nerves. And each different kiss show us so much about them and their need to "insulate the pain" with eachother.
Pete choosing to belong to Vegas in all the messiness and power dynamics that implies and Vegas refusing some of the power he had earlier taken and retreating from some of the lines he had crossed.