Kissing varies from rabbit to rabbit. Some will love to give kisses and groom their owners while others will never do it. It’s not necessarily and indicator of happiness, merely a shared grooming activity. You’ll know your rabbit is happy if they are generally active, eating, drinking, and curious about their surroundings. If Sprocket kisses you occasionally, that’s great! If he doesn’t, that’s okay too. The fact that he likes to snuggle nose-to-nose with you is a really great expression of his love and affection for you. It is also possible that he grooms fabrics and blankets because he thinks it is you – or another rabbit. That sensation is more like rabbit fur than your skin is, so it’s possible he thinks he is licking you if the blanket is nearby when you snuggle.
Either way, if you want to get another bunny for his company it is an option but it seems to me like he enjoys your company is his own unique way. A bunny that trusts being close to you is a very special gift.