All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
In principle, it is permissible for a husband to enjoy his wife in any manner he wishes provided he avoids two matters:
1- Anal sex: this is absolutely forbidden;
2- Having sexual intercourse with the wife in her vagina when she is in menses or in post-partum bleeding.
Similarly, a woman may enjoy the body of her husband as she wishes and the French kiss is among the permissible manners of enjoyment between the spouses, so you are not sinful for doing it and your wife is obliged to honor your request.
Indeed, Shaykh Ibn Taymiyyah considers the preponderant opinion to be that the wife is obliged to respond to all kinds of permissible enjoyment with her husband.
For more benefit, please refer to Fatwa 82256.
Allaah Knows best.