What tf do you do when your 14 year old tells you he fingered a girl in the back of the movie theater

My son went on a group date 2 hours ago and I went to pick him up about 13 minutes ago and he was awkwardly quiet. Then he turned the radio off and just randomly exclaimed that he fingered his "girlfriend" and she jerked him off & he feels gross for doing it. I didn't really know how to respond so I just started with "Okayyyy..." And left it at that. I just don't know what to do with this information or WHY I needed to know. Thanks for the unecessary image..