No, Lisa didn't want to forget Dean. There was a lot of bad, a lot of scary, and horrible, but there was also so much good too. She didn't want to lose that. She understood why Dean had taken their memories; he wanted to protect them and the best way he knew was for them to never have known him in the first place. As bad as things might have been, Lisa wouldn't have wanted that...not then and not now. As scary as having these memories back was, she was grateful Dean had decided to let her have them.
"I know. Dean, in an imperfect world, you made the best choice you could. I can't hate you for that. You were protecting Ben." Never could she ever hate him for doing what was best for Ben. Ever.
Lisa hadn't expected the kiss, but then he moved in, lips on hers and Lisa remembered all too well the rush that was kissing Dean Winchester. It was tender and sweet, washing over her, and Lisa, while initially surprised, moved to kiss him back a moment later.
There was still a lot they needed to talk about...more specifically about Ben, but for the time she was more than content with letting it slide. He pulled back, but only for a moment before moving back in to deepen the kiss. Lisa allowed it. They could figure out the next step after this moment.