Imagine Dean and Cas doing their shopping together. And of course Cas would have put lube and condoms on the list because “Dean, we’ve run out”
And Cas would be completely unembarrassed to stand in the ‘family planning’ aisle and debate the relative merits of this or that purchase with Dean.
“Should we get the economy pack of condoms? We do go through them quickly.”
“‘Ribbed for her pleasure’? Surely they’re just as effective as providing a man pleasure as a woman?”
“Dean, they only have cherry flavored lubricant, not strawberry.”
Dean would just get so embarrassed because he feels like everyone in the aisle is staring at them as Cas muses out loud whether ‘his and hers’ lubricant would be safe to use and whether it would add anything to the experience.
Eventually, Dean just tells Cas to grab a bottle of regular lube and some non-fancy condoms so they can just go.