Suggestions for intimate activities to make you feel closer to your partner?

Me and my boyfriend are very close and connected with each other, and when we hang out, we want to be as close as possible. We've done stuff like wearing one shirt and both being in it which is kind of stupid but still fun and giving massages, but we wanna do more personal and like skin-to-skin stuff thats not sex. We've obviously done stuff like cuddling and kissing, so we're looking for more obscure things to try to be intimate.