I do kinda think it's both . . . it's my "thing". We all have a particular thing, regardless of being on the spectrum or not, and regardless of sexual preference. Some people like legs, others chests, hips, feet (weirdos) etc etc . . . hell, there's people out there who get off on looking at and touching quite literally any body part.
It's a sexual thing, obviously. It's always a stroke, squeeze or full-on dry humping at any given opportunity (which is done in a jokey tongue-in-cheek way most of the time) . . . maybe "tongue-in-cheek" is not the best of phrases, given the context
To say it's my favourite part of the body sexually speaking feels like an understatement. Saying it's an understatement also feels like an understatement!
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"You're entitled to your wrong opinion..."