There is no pill that would increase your penis size. Depending upon your current situation and customs, try to have a lengthy amount of foreplay with your wife and consider using oral methods to help satisfy her.
No pill, but you can do things with hands and mouth. It was mean of your wife to laugh.
Use foreplay. Use dildos. Use lubricants. Play with her (without penetration) for 15-20mins, then penetrate her. When you are done, play with her again till she is satisfied or you are ready for 2nd lap.