Hello.
During sexual reponse, the body undergoes many changes. One of these is that the whole area around your crotch fills with blood, which results in a deepening in color as well as swelling of the tissues. If you were to examine your lips, vaginal entrance, clitoral glans, etc., before you get turned on and then after arousal, you'd see a big difference. It's this blood rushing to your crotch that creates lubrication, among other things. It's a good thing, so no need to worry. Dr. J
It might be normal- alot of people swell up and/or get pretty red afterwards. Does it hurt?
IT'S NORMAL-YOU MUST HAVE REALLY ENJOYED IT