Armpits

Some have a fetish for axillary (armpit) smell or licking. It’s fairly niche but if one of you enjoys the natural musk of an armpit or the taboo of licking there, incorporate it. Could tie arms up so they’re exposed and tease with your tongue or nose. This overlaps with sweat fetish possibly. Only do if both are okay with that level of musk and intimacy. (It was also listed earlier in “between channel” and fetish because it’s both a body part and a specific interest.)