[It's strange to be kissing someone he's allowed to kiss under these circumstances. It's usually embarrassing and awkward or—in a few cases—exciting and forbidden. Or something just a little less intense than forbidden but certainly unexpected.
Still, he hasn't been with Martha long and he's still trying to figure out what they are exactly and how it's supposed to work in prison with him trying to escape and her memories of Tom and his...friendship with Elena. It's complicated especially when he stops to think about it. Things usually work more smoothly when he just acts.
Like when he puts his arm around her and pulls her in just a bit closer while they kiss.]